[llvm] [IR] Use iteration limit in stripAndAccumulateConstantOffsets (PR #190473)

[Alexis Engelke via llvm-commits]

aengelke wrote:

[stage2-O3 -0.05%](https://llvm-compile-time-tracker.com/compare.php?from=f5d50d9371990b861e2c2a8b0ed19b090db46a85&to=63476334d83a4c9092cdcc54e377b7dceb34c1b0&stat=instructions:u); hardly measurable with sufficient significance. Nonetheless, I feel that an iteration limit is warranted here.

https://github.com/llvm/llvm-project/pull/190473