Use ImmutableCallSite for statepoint verification.
Use ImmutableCallSite for statepoint verification.

Patch by: Igor Laevsky

"This change generalizes statepoint verification to use ImmutableCallSite instead of CallInst. This will allow to easily implement invoke statepoint verification (in a following change)."

Differential Revision: http://reviews.llvm.org/D7308



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@228064 91177308-0d34-0410-b5e6-96231b3b80d8

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