Share some array code between CoreCLR and NativeAOT

[huoyaoyuan]

Shares the major logic of Copy and Clear, cleared some others.

Using coreclr behavior has source of truth. NativeAOT didn't support primitive widen for enum->enum.

[filipnavara]

Good job. At least the System.Tests.ArrayTests.Copy_SourceAndDestinationPointers_ThrowsArrayTypeMismatchException test failure on windows/osx-arm64 seems relevant.

[huoyaoyuan]

At least the System.Tests.ArrayTests.Copy_SourceAndDestinationPointers_ThrowsArrayTypeMismatchException test failure on windows/osx-arm64 seems relevant.

Yes I've mentioned it, I'm having trouble for running nativeaot tests locally, or mapping the throwing offset to code.

[filipnavara]

Not sure if it helps but in debug build it asserts here:

  Process terminated. Assertion failed.
  we expect type definitions here
     at System.Diagnostics.DebugProvider.Fail(String, String) + 0x50
     at System.Diagnostics.Debug.Fail(String, String) + 0x5c
     at System.Diagnostics.Debug.Assert(Boolean, String, String) + 0x48
     at System.Diagnostics.Debug.Assert(Boolean, String) + 0x2c
     at Internal.Runtime.MethodTable.get_NonArrayBaseType() + 0x80
     at Internal.Runtime.WellKnownEETypes.IsSystemObject(MethodTable*) + 0x48
     at System.Array.CanAssignArrayType(Array sourceArray, Array destinationArray) + 0x2f4
     at System.Array.CopyImpl(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable) + 0x34c
     at System.Array.Copy(Array sourceArray, Array destinationArray, Int32 length) + 0x260
     at System.Tests.ArrayTests.<>c.<Copy_SourceAndDestinationPointers_ThrowsArrayTypeMismatchException>b__69_2() + 0x50
     at Xunit.Assert.RecordException(Action) + 0x54
     at System.Runtime!<BaseAddress>+0x295a608
     at System.Tests.ArrayTests.Copy_SourceAndDestinationPointers_ThrowsArrayTypeMismatchException() + 0x288

[huoyaoyuan]

OK, I was thinking no exception was thrown and the pointer types passed assignment test, and figuring out which line passes. Thanks for pointing out the failing stack trace.

[jkotas]

/azp run runtime-nativeaot-outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jkotas]

LGTM. Thank you!