[PATCH] D11550: [Statepoints] Let patchable statepoints have a symbolic call target.

[Sanjoy Das]

sanjoy created this revision.
sanjoy added reviewers: reames, swaroop.sridhar.
sanjoy added a subscriber: llvm-commits.

As added initially, statepoints required their call targets to be a
constant pointer null if ``numPatchBytes`` was non-zero.  This turns out
to be a ergonomic problem, since there is no way to mark patchable
statepoints as calling a readable symbolic value.

This change remove the restriction of requiring ``null`` call targets
for patchable statepoints, and changes PlaceSafepoints to maintain the
symbolic call target through its transformation.

http://reviews.llvm.org/D11550

Files:
  docs/Statepoints.rst
  lib/CodeGen/SelectionDAG/StatepointLowering.cpp
  lib/IR/Verifier.cpp
  lib/Transforms/Scalar/PlaceSafepoints.cpp
  test/Transforms/PlaceSafepoints/patchable-statepoints.ll
  test/Verifier/invalid-patchable-statepoint.ll

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