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These seemed to have been used in the past but were since removed by the add_compile_flags_if_supported functions that combine these these checks and adding the flag, but the original checks were never removed. Differential Revision: https://reviews.llvm.org/D62566 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@362058 91177308-0d34-0410-b5e6-96231b3b80d8