Fixing where ClearContained is called for certain Arm64 cast ops

[tannergooding]

This resolves#76511

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

---

This resolves #76511

Author:	tannergooding
Assignees:	-
Labels:	area-CodeGen-coreclr
Milestone:	-

[tannergooding]

/azp run runtime-coreclr outerloop, runtime-coreclr jitstress, runtime-coreclr gcstress0x3-gcstress0xc, Fuzzlyn

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).

[tannergooding]

AV failures need: #76532

[tannergooding]

The failure for Runtime_40607 is #76546

[tannergooding]

CC. @dotnet/jit-contrib

This resolves #76511. Failures all look to be known. It might be desirable to wait to merge this until after #76532 goes in since that will fix most of the AVs.

[tannergooding]

Merged in main to pickup #76532

[tannergooding]

/azp run runtime-coreclr outerloop, runtime-coreclr jitstress, runtime-coreclr gcstress0x3-gcstress0xc, Fuzzlyn

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).

[tannergooding]

jitstress failures were all known:

• Assertion failed 'src->OperIs(GT_LCL_VAR, GT_LCL_FLD, GT_FIELD, GT_IND, GT_OBJ, GT_CALL, GT_MKREFANY, GT_RET_EXPR, GT_COMMA, GT_CNS_VEC) || ((src->TypeGet() != TYP_STRUCT) && src->OperIsSIMD())' #76550 - JIT\Regression\JitBlue\Runtime_72926\Runtime_72926\Runtime_72926.cmd
• Test failure: JIT\\jit64\\opt\\lur\\lur_02\\lur_02.cmd #76507 - JIT\jit64\opt\lur\lur_02\lur_02.cmd
• Test failure: JIT\\Regression\\JitBlue\\Runtime_40607\\Runtime_40607\\Runtime_40607.cmd #76546 - JIT\Regression\JitBlue\Runtime_40607\Runtime_40607\Runtime_40607.cmd