2f89d4a8c7
Introduce a new LoopGuards class to track info from loop guards and split off collecting rewrite info to LoopGuards::collect. This allows users of applyLoopGuards to collect rewrite info once in cases where the same loop guards are applied multiple times. This is used to collect rewrite info once in howFarToZero, which saves a bit of compile-time: stage1-O3: -0.04% stage1-ReleaseThinLTO: -0.02% stage1-ReleaseLTO-g: -0.04% stage2-O3: -0.02% https://llvm-compile-time-tracker.com/compare.php?from=117b53ae38428ca66eaa886fb432e6f09db88fe4&to=4ffb7b2e1c99081ccebe6f236c48a0be2f64b6ff&stat=instructions:u Notably this improves mafft by -0.9% with -O3, -0.11% with LTO and -0.12% with stage2-O3. PR: https://github.com/llvm/llvm-project/pull/97316
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