[PATCH] Introduce bitset metadata format and bitset lowering pass.

[Sean Silva]

Can you please break the docs for this into a separate document? This is what we have been doing lately for "large" new IR features, like stackmaps, statepoints and inalloca. I think this feature qualifies. The separate document format gives a bit more breathing room for discussing the design and rationale of the feature, along with providing more in-depth explanation and examples.


http://reviews.llvm.org/D7288

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