llvm-project

299a55a8 - [InstCombine][Docs] Update InstCombine contributor guide (#144228)

[InstCombine][Docs] Update InstCombine contributor guide (#144228) Update the guideline to reduce the chance of miscompilation/performance regression. --------- Co-authored-by: Nikita Popov <github@npopov.com> Co-authored-by: Antonio Frighetto <me@antoniofrighetto.com>