[clang] [llvm] [gcov] Add support for -fprofile-abs-path (PR #230077)

[Nicolas Qiu Guichard via cfe-commits]

nicolas-guichard wrote:

> Please reply to this message to confirm that you have read these policies, especially the LLVM AI Tool Use Policy, and that any AI tool usage has been noted in the PR description.

No AI tools have been used to write this PR. AFAICT I respected the other policies as well.

https://github.com/llvm/llvm-project/pull/230077