Johannes Doerfert 29c8ebad10 [MemoryBuiltins][FIX] Adjust index type size properly wrt. AS casts ...

Use existing functionality to strip constant offsets that works well
with AS casts and avoids the code duplication.

Since we strip AS casts during the computation of the offset we also
need to adjust the APInt properly to avoid mismatches in the bit width.
This code ensures the caller of `compute` sees APInts that match the
index type size of the value passed to `compute`, not the value result
of the strip pointer cast.

Fixes #53559.

Differential Revision: https://reviews.llvm.org/D118727

2022-02-07 20:19:19 -06:00

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