…net#102998)"

This reverts commit c286a8e.

…s up front (#103052)

* [interp] handle box + brtrue/brfalse pattern for byreflike types

   In cases where we don't do cprop and deadce (for example if `mono_interp_opt` is 0 because we're debugging) don't emit a box_vt opcode before a branch.  Instead just emit a constant true

   Fixes #102988

* Revert "Revert uses of Unsafe.BitCast with spans to unblock mono (#102998)"

   This reverts commit c286a8e.

   Reverts #102998

* remove the box byreflike retry code

   we handle box byreflike code patterns directly now

* handle box;isinst;{brtrue|brfalse|unbox.any} IL patterns

* Add test locking down mismatched box;isinst;unbox.any pattern

* remove the mismatch case in the interp.  throw IPE at execution time

* Update src/tests/Loader/classloader/generics/ByRefLike/Validate.cs

Co-authored-by: Aaron Robinson <arobins@microsoft.com>

---------

Co-authored-by: Aaron Robinson <arobins@microsoft.com>

…2998)"

This reverts commit c286a8e.