[libc++] Simplify the implementation of remove_reference (#85207)
GCC 13 introduced the type trait `__remove_reference`. We can simplify
the implementation of `remove_reference` a bit by using it.
PR: 280562
MFC after: 1 month
(cherry picked from commit a7b2d7f261)
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-19-init-18630-gf2ccf80136a0, the
last commit before the upstream release/19.x branch was created.
PR: 280562
MFC after: 1 month
(cherry picked from commit 0fca6ea1d4)
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project main llvmorg-17-init-19304-gd0b54bb50e51, the
last commit before the upstream release/17.x branch was created.
PR: 273753
MFC after: 1 month
(cherry picked from commit 06c3fb2749)
