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[Fuzzing] [adamsitnik] [NRBF] Fix bugs discovered by the fuzzer #635

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Job completed in 1 hour 4 minutes.
dotnet/runtime#107368

// NrbfDecoderFuzzer
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'primitiveType')
Actual value was Null.
   at System.Formats.Nrbf.Utils.TypeNameHelpers.GetPrimitiveTypeName(PrimitiveType primitiveType)
   at System.Formats.Nrbf.Utils.TypeNameHelpers.GetPrimitiveSZArrayTypeName(PrimitiveType primitiveType)
   at System.Formats.Nrbf.MemberTypeInfo.GetArrayTypeName(ArrayInfo arrayInfo)
   at System.Formats.Nrbf.RectangularArrayRecord.get_TypeName()
   at DotnetFuzzing.Fuzzers.NrbfDecoderFuzzer.Test(Span`1 testSpan, MemoryStream stream) in D:\runner-dir\runtime\src\libraries\Fuzzing\DotnetFuzzing\Fuzzers\NrbfDecoderFuzzer.cs:line 54
   at DotnetFuzzing.Fuzzers.NrbfDecoderFuzzer.FuzzTarget(ReadOnlySpan`1 bytes) in D:\runner-dir\runtime\src\libraries\Fuzzing\DotnetFuzzing\Fuzzers\NrbfDecoderFuzzer.cs:line 26
   at SharpFuzz.Fuzzer.LibFuzzer.Run(ReadOnlySpanAction action, Boolean ignoreExceptions)
==6440== ERROR: libFuzzer: deadly signal
NOTE: libFuzzer has rudimentary signal handlers.
      Combine libFuzzer with AddressSanitizer or similar for better crash reports.
SUMMARY: libFuzzer: deadly signal
MS: 1 CrossOver-; base unit: 7967cc6c6d0c11820eef8f9d8bd26cb641d25cd9
0x0,0x1,0x0,0x0,0x0,0xff,0xff,0xff,0xff,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x7,0x1,0x0,0x0,0x0,0x2,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x10,0x0,0x0,0x0,0x0,0x0,0x7,0x1,0x17,0xf4,0x0,0x2,0x8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x0,0x10,0x0,0x0,0x7,0x11,0xb,
\000\001\000\000\000\377\377\377\377\001\000\000\000\000\000\000\000\007\001\000\000\000\002\010\000\000\000\000\000\000\000\000\001\000\020\000\000\000\000\000\007\001\027\364\000\002\010\000\000\000\000\000\000\000\001\000\020\000\000\007\021\013
artifact_prefix='./'; Test unit written to NrbfDecoderFuzzer-artifact-3
Base64: AAEAAAD/////AQAAAAAAAAAHAQAAAAIIAAAAAAAAAAABABAAAAAAAAcBF/QAAggAAAAAAAAAAQAQAAAHEQs=

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