[libc] Move LLVM_LIBC_IS_DEFINED macro to its own header (#190081) This moves the LLVM_LIBC_IS_DEFINED macro to its own header is __support/macros. Its implementation leverages cpp::string_view instead of rolling its own strcmp; this necessitated fixing several missing constexpr in the string_view implementation. The new __support/macros/macro-utils.h is also broken out to hold the stringification macro and can be used in future for token pasting shenanigans and other such generic macro machinery.
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