[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Michael Kuperstein]

Ping.

Tim, do you want me to make this change to the AArch64 part as is? 
You said you may have another idea.

Regardless, could anyone take a look at the wrapper around bitset, to make sure this makes sense?


http://reviews.llvm.org/D7065

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