[llvm-branch-commits] [msan] Switch to -msan-handle-icmp-exact my default (PR #113200)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/113200

Fixes #111212.

This grows .text by 5.3% on CTMark, (or 2.6% large internal binary)
Perf regressed by 1.6%. We will try to improve in follow up patches.

It worth to pay some performance regression to fix
correctness to avoid stuff like #111212.