Owen Anderson ab15976173 CallPromotionUtils: Correctly use IndexSize when determining the bit width of pointer offsets. (#119483) ...

This reapplies #119138 with a defensive fix for the assertion failure
when building libcxx.
Unfortunately the failure does not reproduce on my machine, so I am not
able to extract a test case.

The key insight for the fix comes from Jessica Clarke, who observes that
`VTablePtr` may, in fact,
not be a pointer on return from `FindAvailableLoadedValue`.

Co-authored-by: Alexander Richardson <alexander.richardson@cl.cam.ac.uk>

2024-12-11 16:49:48 +13:00

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