[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Michael Kuperstein]

I couldn't figure out how to update an already-closed revision.
Uploaded a rebased version as http://reviews.llvm.org/D8542

Renato, can you check if you can self-host with this on ARM/AArch? If you can, I'll try to commit it again.
(Or I could just commit, and see what the fallout is :-) )


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http://reviews.llvm.org/D7065

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