This adds support for EnC on arm64. A couple of notes on the
implementation compared to x64:
- On x64 we get the fixed stack size from unwind info. However, for the
  frames we set up on arm64 for EnC it is not possible to extract the
  frame size from there because their prologs generally look like

  stp fp, lr, [sp,#-16]!
  mov fp, sp
  sub sp, sp, dotnet#144

  with unwind codes like the following:

  set_fp; mov fp, sp

  save_fplr_x #1 (0x01); tp fp, lr, [sp, #-16]!

  As can be seen, it is not possible to get the fixed stack size from
  unwind info in this case. Instead we pass it through the GC info that
  already has a section for EnC data.

- On arm64 the JIT is required to place the PSPSym at the same offset
  from caller-SP for both the main function and for funclets. Due to
  this we try to allocate the PSPSym as early as possible in the main
  function and we must take some care in funclets.  However, this
  conflicts with the EnC frame header that the JIT uses to place values
  that must be preserved on EnC transitions. This is currently
  callee-saved registers and the MonitorAcquired boolean.

  Before this change we were allocating PSPSym above (before) the
  monitor acquired boolean, but we now have to allocate MonitorAcquired
  first, particularly because the size of the preserved header cannot
  change on EnC transitions, while the PSPSym can disappear or appear.
  This changes frame allocation slightly for synchronized functions.

These helpers are used to report names of things in warnings. The functional changes are:
* For method parameters, use the parameter name if available (and only if not fallback to the #1 notation)
* For property accessor methods, use the C# naming scheme, so for example Type.Property.get instead of Type.get_Property.

Both of these changes are in preparation to bring NativeAOT closer in behavior to ILLink and the trim analyzers.

For this I moved some of the helpers to the common shared code.

Some unrelated code cleanup as well.

Co-authored-by: Michal Strehovský <MichalStrehovsky@users.noreply.github.com>

* Initial implementation for contract customization

fix build errors

Move converter rooting to DefaultJsonTypeInfoResolver so that it can be used standalone

Fix ConfigurationList.IsReadOnly

Minor refactorings (#1)

* Makes the following changes:

* Move singleton initialization for DefaultTypeInfoResolver behind a static property.
* Consolidate JsonSerializerContext & IJsonTypeInfoResolver values to a single field.
* Move reflection fallback logic away from JsonSerializerContext and into JsonSerializerOptions

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs

* remove testing of removed field

Simplify the JsonTypeInfo.CreateObject implemenetation (#2)

* Simplify the JsonTypeInfo.CreateObject implemenetation

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoOfT.cs

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoOfT.cs

Co-authored-by: Krzysztof Wicher <mordotymoja@gmail.com>

Co-authored-by: Krzysztof Wicher <mordotymoja@gmail.com>

Tests and fixes for JsonTypeInfoKind.None

TypeInfo type mismatch tests

Allow setting NumberHandling on JsonTypeInfoKind.None

test resolver returning wrong type of options

JsonTypeInfo/JsonPropertyInfo mutability tests

rename test file

Move default converter rooting responsibility behind DefaultJsonTypeInfoResolver (#3)

* Move default converter rooting responsibility behind DefaultJsonTypeInfoResolver

* address feedback

Add simple test for using JsonTypeInfo<T> with APIs directly taking it

fix and tests for untyped/typed CreateObject

uncomment test cases, remove todo

More tests and tiny fixes

Add a JsonTypeInfoResolver.Combine test for JsonSerializerContext (#4)

* Fix JsonTypeInfoResolver.Combine for JsonSerializerContext

* Break up failing test

Fix simple scenarios for combining contexts (#6)

* Fix simple scenarios for combining contexts

* feedback

JsonSerializerContext combine test with different camel casing

Remove unneeded virtual calls & branching when accessing Get & Set delegates (#7)

JsonPropertyInfo tests everything minus ShouldSerialize & NumberHandling

Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonConverterOfT.cs

Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonConverterOfT.cs

throw InvalidOperationException rather than ArgumentNullException for source gen when PropertyInfo.Name is assigned through JsonPropertyInfoValues

tests for duplicated property names and JsonPropertyInfo.NumberHandling

Add tests for NumberHandling and failing tests for ShouldSerialize

disable the failing test and add extra checks

disable remainder of the failing ShouldSerialize tests, fix working one

Fix ShouldSerialize and IgnoreCondition interop

Add failing tests for CreateObject + parametrized constructors

Fix CreateObject support for JsonConstructor types (#10)

* Fix CreateObject support for JsonConstructor types

* address feedback

Make contexts more combinator friendly (#9)

* Make contexts more combinator friendly

* remove converter cache

* redesign test to account for JsonConstructorAttribute

* Combine unit tests

* address feedback

* Add acceptance tests for DataContract attributes & Specified pattern (#11)

* Add private field serialization acceptance test (dotnet#13)

* tests, PR feedback (dotnet#14)

* PR feedback and extra tests

* Shorten class name, remove incorrect check (not true for polimorphic cases)

* Make parameter matching for custom properties map property Name with parameter (dotnet#16)

* Test static initialization with JsonTypeInfo (dotnet#17)

* Fix test failures and proper fix this time (dotnet#18)

* Fix test failures and proper fix this time

* reinstate ActiveIssueAttribute

* PR feedback and adjust couple of tests which don't set TypeInfoResolver

* fix IAsyncEnumerable tests

* Lock JsonSerializerOptions in JsonTypeInfo.EnsureConfigured()

Co-authored-by: Eirik Tsarpalis <eirik.tsarpalis@gmail.com>

Co-authored-by: Eirik Tsarpalis <eirik.tsarpalis@gmail.com>

E.g.,

Update LSRA "Allocating Registers" table description.

Dump nodes added during resolution, e.g.:
```
   BB29 bottom (BB08->BB08): move V25 from STK to rdi (Critical)
N001 (  1,  1) [001174] ----------z                 t1174 =    LCL_VAR   int    V25 cse4          rdi REG rdi
```

Dump more data in the LSRA block sequence data:
```
-BB03( 16   )
-BB04(  4   )
+BB03 ( 16   ) critical-in critical-out
+BB04 (  4   ) critical-out
```

When dumping various flow bitvectors, annotate the bitvectors better:
```
-BB25 in gen out
-0000000000000000
-0000000000000003 CSE #1.c
-0000000000000003 CSE #1.c
+BB25
+ in: 0000000000000000
+gen: 0000000000000003 CSE #1.c
+out: 0000000000000003 CSE #1.c
```

Dump hoisting bitvectors using the sorting number:
```
-  USEDEF  (5)={V04 V00 V01 V02 V03}
+  USEDEF  (5)={V00 V01 V02 V03 V04}
```

Also, fix various typos and formatting.

…tnet#87189)

This fixes a startup crash on Big Sur:

> error: * Assertion at /Users/runner/work/1/s/src/mono/mono/utils/mono-hwcap-arm64.c:35, condition `res == 0' not met

Because sysctl can't find some of these options:

    $ sysctl hw.optional.armv8_crc32
    hw.optional.armv8_crc32: 1
    $ sysctl hw.optional.arm.FEAT_RDM
    sysctl: unknown oid 'hw.optional.arm.FEAT_RDM'
    $ sysctl hw.optional.arm.FEAT_DotProd
    sysctl: unknown oid 'hw.optional.arm.FEAT_DotProd'
    $ sysctl hw.optional.arm.FEAT_SHA1
    sysctl: unknown oid 'hw.optional.arm.FEAT_SHA1'
    $ sysctl hw.optional.arm.FEAT_SHA256
    sysctl: unknown oid 'hw.optional.arm.FEAT_SHA256'
    $ sysctl hw.optional.arm.FEAT_AES
    sysctl: unknown oid 'hw.optional.arm.FEAT_AES'

Full stack trace:

* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
  * frame #0: 0x0000010ef37560 libmonosgen-2.0.dylib`monoeg_assertion_message
    frame #1: 0x0000010ef375cc libmonosgen-2.0.dylib`mono_assertion_message + 32
    frame #2: 0x0000010ef40d6c libmonosgen-2.0.dylib`mono_hwcap_arch_init + 544
    frame #3: 0x0000010ef54bd8 libmonosgen-2.0.dylib`mono_hwcap_init + 72
    frame #4: 0x0000010ee14dc0 libmonosgen-2.0.dylib`parse_optimizations + 52
    frame #5: 0x0000010edbed48 libmonosgen-2.0.dylib`mono_init
    frame #6: 0x0000010ee18968 libmonosgen-2.0.dylib`mono_jit_init_version
    frame #7: 0x0000010f48a300 libxamarin-dotnet-debug.dylib`xamarin_bridge_initialize + 216
    frame #8: 0x0000010f4900a4 libxamarin-dotnet-debug.dylib`xamarin_main + 376