* static PGO compatible with llvm18 and add CI job to test static PGO on coremark benchmark * update comments and warning info, bitmaps section in llvm profdata shouldn't be used in PGO
* static PGO compatible with llvm18 and add CI job to test static PGO on coremark benchmark * update comments and warning info, bitmaps section in llvm profdata shouldn't be used in PGO