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[X86] Add support for more than 32 features for __builtin_cpu_is
libgcc supports more than 32 features by adding a new 32-bit variable __cpu_features2. This adds the clang support for checking these feature bits. Patches for compiler-rt and llvm to support this are coming as well. Probably still need an additional patch for target multiversioning in clang. Differential Revision: https://reviews.llvm.org/D53458 llvm-svn: 344832
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