[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Vladimir Sukharev]

Hi, 
my investigations finally showed AArch64 backend doesn't have a bug.
At it's been told, it's a huge mess instead. The following field and methods mean completely different things in classes MCTargetAsmParser and MCInstPrinter, despite the spelling are identical.

  uint64_t AvailableFeatures; and
  uint64_t getAvailableFeatures(); void setAvailableFeatures(uint64_t Value);

We should just take care, which one to use. It will be simpler after the refactoring proposed here.
Do you have any success continuing this so much needed work in other backends after revert?


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  rL LLVM

http://reviews.llvm.org/D7065

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