[libc++] Revert <stdatomic.h> changes
This reverts commits a30a7948 and 5d1c1a24, which broke the LLDB data formatters tests because they build with modules in C++11 mode. Differential Revision: https://reviews.llvm.org/D97044
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This reverts commits a30a7948 and 5d1c1a24, which broke the LLDB data formatters tests because they build with modules in C++11 mode. Differential Revision: https://reviews.llvm.org/D97044