[release/6.0] Fix fgValueNumberArrIndexVal for wide reads #58427
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jeffschwMSFT
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Backport of #58309 to release/6.0
/cc @EgorBo
Customer Impact
In some very specific patterns where we read values from managed arrays using
Unsafe.ReadUnaligned(e.g. when we read alongfrom an array of integers at once) we might get invalid values, see the test this PR adds.Testing
The fix contains a test.
Risk
Low, it affects only very specific patterns with Unsafe.