-ftime-report: reorganize timers#122225

MaskRay merged 7 commits intomainllvm/llvm-project:mainfrom

users/MaskRay/spr/-ftime-report-move-codegen-timers-into-frontendtimergroupllvm/llvm-project:users/MaskRay/spr/-ftime-report-move-codegen-timers-into-frontendtimergroupCopy head branch name to clipboard