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

[Reid Kleckner via cfe-commits]

https://github.com/rnk commented:

This seems fine to me, but it's hard to understand if this is redundant with some other "ParseFunction" scope from the tests. WDYT @MaskRay ?

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