[PATCH] Replace the bitfield of SubtargetFeatures with a BitVector

[Chandler Carruth]

FWIW, I don think this is generally the right direction.

Some simplifying thoughts:

1. Look at fixing the incompatible usages prior to changing the type. For example, putting the bits into a union seems like a bad idea anyways.

2. Is the number of bits a compile time thing? If so, then std::bitset would work much better than BitVector and likely avoid some of the complexity here. There is also SmallBitVector if the number is dynamic but usually small.


http://reviews.llvm.org/D7065

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