[llvm] CallPromotionUtils: Correctly use IndexSize when determining the bit width of pointer offsets. (PR #119138)

[Owen Anderson via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --scrub-attributes
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resistor wrote:

Sorry, I missed that you'd provided a suggested comment here. Will incorporate.

https://github.com/llvm/llvm-project/pull/119138