9a2df55f47
Change the format of IRPGO counter names to `[<filepath>;]<mangled-name>` which is computed by `GlobalValue::getGlobalIdentifier()` to fix #74565. In fe051934cbb0aaf25d960d7d45305135635d650b (https://reviews.llvm.org/D156569) the format of IRPGO counter names was changed to be `[<filepath>;]<linkage-name>` where `<linkage-name>` is basically `F.getName()` with some prefix, e.g., `_` or `l_` on Mach-O (yes, it is confusing that `<linkage-name>` is computed with `Mangler().getNameWithPrefix()` while `<mangled-name>` is just `F.getName()`). We discovered in #74565 that this causes some missed import issues on some targets and #74008 is a partial fix. Since `<mangled-name>` may not match the `<linkage-name>` on some targets like Mach-O, we will need to post-process the output of `llvm-profdata order` before passing to the linker via `-order_file`. Profiles generated after fe051934cbb0aaf25d960d7d45305135635d650b will become stale after this diff, but I think this is acceptable since that patch landed after the LLVM 18 cut which hasn't been released yet.
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