[clang] [Clang][Parse] Delay parsing of noexcept-specifiers in friend function declarations (PR #90517)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

This actually requires a little more work... (the delayed exception specification parsing code seems to only expect `CXXMethodDecl`s). I'll take care of that tomorrow. 

https://github.com/llvm/llvm-project/pull/90517