[clang] [PAC] Re-sign a pointer to a noexcept member function when it is converted to a pointer to a member function without noexcept (PR #109056)

[Akira Hatanaka via cfe-commits]

ahatanak wrote:

This change isn't needed anymore as it was decided that `noexcept` shouldn't be used to compute discriminators of function and member function pointers (see https://github.com/llvm/llvm-project/issues/106487#issuecomment-2440364300).

https://github.com/llvm/llvm-project/pull/109056