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clang-p2996/llvm
Mircea Trofin d2500e639b [pgo] add means to specify "unknown" MD_prof (#145578)
This PR is part of https://discourse.llvm.org/t/rfc-profile-information-propagation-unittesting/73595

In a slight departure from the RFC, instead of a brand-new `MD_prof_unknown` kind, this adds a first operand to `MD_prof` metadata. This makes it easy to replace with valid metadata (only one `MD_prof`), otherwise sites inserting valid `MD_prof` would also have to check to remove the `unknown` one.

The patch just introduces the notion and fixes the verifier accordingly. Existing APIs working (esp. reading) `MD_prof` will be updated subsequently.
2025-06-30 16:57:11 -07:00
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