[6.0][IRGen] Fix alignment for imported C types in CVW #73406
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rdar://127279770 When an imported C type is over or under aligned, we did not use the alignment of the type, but computed the maximum alignment of its components, causing alignment issues in compact value witnesses.
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tbkka
approved these changes
May 6, 2024
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Explanation: When an imported C type is over or under aligned, we did not use the alignment of the type, but computed the maximum alignment of its components, causing alignment issues in compact value witnesses.
Scope: Compact value witnesses
Original PR: #73405
Risk: Low, only affects compact value witnesses
Testing: Added test that observed the issue before the fix and does not with it.
Issue: rdar://127279770
Reviewer: @mikeash