[clang] [Clang] Ensure the method scope at the late parsing of noexcept specifiers (PR #98023)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Looks like this caused a regression in `std/utilities/tuple/tuple.tuple/tuple.cnstr/PR23256_constrain_UTypes_ctor.pass.cpp`... I will look into that.

https://github.com/llvm/llvm-project/pull/98023