[PATCH] [Inlining] Teach the inliner pass to inline through statepoints.

[Sanjoy Das]

I've merged http://reviews.llvm.org/D10633 and http://reviews.llvm.org/D10632 into http://reviews.llvm.org/D10758.  Their combined size is not too large IMO, and keeping them together lets me avoid adding unneeded complexity via flags like `-spp-dont-pre-inline-polls` just for testing.


http://reviews.llvm.org/D10633

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