[libcxx] remove unused code The macro _LIBCPP_UNROLL_LOOPS isn't used anywhere so the code was dead. Differential Revision: https://reviews.llvm.org/D26991 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@288143 91177308-0d34-0410-b5e6-96231b3b80d8 
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