David Tenty a83004f4ff [libcxx][AIX][z/OS] Remove headers included via _IBMCPP__
D127650 removed support for non-clang-based XL compilers, but left some
of the headers used only by this compiler and included under the
__IBMCPP__ macro. This change cleans this up by deleting these headers.

Reviewed By: hubert.reinterpretcast, fanbo-meng

Differential Revision: https://reviews.llvm.org/D129491
2022-07-14 15:41:46 -04:00
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