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Revision tags: llvmorg-21-init, llvmorg-19.1.7, llvmorg-19.1.6, llvmorg-19.1.5, llvmorg-19.1.4
# cacbe71a 06-Nov-2024 Yingwei Zheng <dtcxzyw2333@gmail.com>

[Analysis] Avoid running transform passes that have just been run (#112092)

This patch adds a new analysis pass to track a set of passes and their
parameters to see if we can avoid running transfor

[Analysis] Avoid running transform passes that have just been run (#112092)

This patch adds a new analysis pass to track a set of passes and their
parameters to see if we can avoid running transform passes that have
just been run. The current implementation only skips redundant
InstCombine runs. I will add support for other passes in follow-up
patches.

RFC link:
https://discourse.llvm.org/t/rfc-pipeline-avoid-running-transform-passes-that-have-just-been-run/82467

Compile time improvement:
http://llvm-compile-time-tracker.com/compare.php?from=76007138f4ffd4e0f510d12b5e8cad529c21f24d&to=64134cf07ea7eb39c60320087c0c5afdc16c3a2b&stat=instructions%3Au

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