[clang-tools-extra] [clang] [compiler-rt] [PGO] Reland PGO's Counter Reset and File Dumping APIs #76471 (PR #78285)

[Qiongsi Wu via cfe-commits]

qiongsiwu wrote:

@w2yehia and I discussed, and we will remove `__llvm_orderfile_dump` from the main test for now. 

https://github.com/llvm/llvm-project/pull/78285