[PATCH] [Inliner] Teach LLVM to inline through statepoints.

[Sanjoy Das]

Hi reames, pgavlin, swaroop.sridhar,

After this change, LLVM can inline through through some calls / invokes
wrapped in `gc_statepoint`.  The cost analysis pass does not currently
grok statepoints.  We only inline through a gc_statepoint if the call is
alwaysinline.

Depends on D10631

Previously was split into D10632 and D10633.

http://reviews.llvm.org/D10758

Files:
  include/llvm/IR/CallSite.h
  lib/Analysis/IPA/InlineCost.cpp
  lib/Transforms/IPO/InlineAlways.cpp
  lib/Transforms/IPO/Inliner.cpp
  lib/Transforms/Utils/InlineFunction.cpp
  test/Transforms/Inline/statepoints-basic.ll

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