llvm-project

b21155f9 - [LoongArch] Precommit test case to show bug in LoongArchISelDagToDag

[LoongArch] Precommit test case to show bug in LoongArchISelDagToDag The optimization level should not be restored into O2. (cherry picked from commit fcc82cfa9394b2bd4380acdcf0e2854caee5a47a)