[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Michael Kuperstein]

Talked to Chandler, he is rather busy and asked me to find some target people to review it if I can. :-)

Can someone verify that this look sane?
Especially the changes to TableGen, and the way FeatureBitset itself is defined. 
Most (although not all) of the changes to the targets themselves are fairly mechanical.


http://reviews.llvm.org/D7065

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