[FixedArray] Fix BitwiseCopyable inference. #77512
Merged
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FixedArray<T> : BitwiseCopyable
iffT : BitwiwseCopyable
; determining this requires usingcheckConformance
, notlookupConformance
.Also fix type-lowering verification for FixedArray--the new aggregate type must be walked into--addressing an asserts-only disableable-via-flag assertion failure.
rdar://139448358