56426c6cdf
This implements the first step of https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079 Make required Bazel and CMake preparatory changes which define the var for the customizable namespace and use it (pass it as a compile option -DLIBC_NAMESPACE=<...>). Differential Revision: https://reviews.llvm.org/D159112
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