[PATCH] InstCombine: propagate deref via new addDereferenceableAttr

[Ramkumar Ramachandra]

Don't assume that the derived pointer can always be cast to an
Argument; dyn_cast and check.


http://reviews.llvm.org/D7510

Files:
  include/llvm/IR/Attributes.h
  include/llvm/IR/Function.h
  include/llvm/IR/Instructions.h
  lib/IR/Attributes.cpp
  lib/IR/Function.cpp
  lib/IR/Instructions.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/gc.relocate.ll

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