[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Vladimir Sukharev]

Hmm, it seems the patch would have also changed the following file accordingly
include/llvm/MC/MCTargetAsmParser.h:  uint64_t getAvailableFeatures() const { return AvailableFeatures; }

else, it will be impossible to use these features in AsmParser


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http://reviews.llvm.org/D7065

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