[libcxx-commits] [libcxx] [libc++] Only use remove_pointer builtin for Clang (PR #91838)

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Chilledheart wrote:

libc++ is well-tested with clang both manual tests and CI. So it is sufficient to exclude other compilers to use their remove_pointer builtin @frederick-vs-ja .

https://github.com/llvm/llvm-project/pull/91838