[clang] [Clang] Add support for GCC bound member functions extension (PR #135649)

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

See also the response from the Clang Area Team: https://discourse.llvm.org/t/rfc-implement-gcc-bound-pmf-in-clang/85951/7.


https://github.com/llvm/llvm-project/pull/135649