[clang] [time-trace] Add a new time trace scope variable named "ParseDeclarationOrFunctionDefinition". (PR #65268)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

LGTM, thank you for this! Please add a release note letting users know about the improvement when you land the changes.

https://github.com/llvm/llvm-project/pull/65268