[PATCH] [GC] improve testing around gc.relocate and catch a bug

[Ramkumar Ramachandra]

Hi reames, sanjoy,

This patch started out as an exploration of gc.relocate, and an attempt
to write a simple test in call-lowering. I then noticed that the
arguments of gc.relocate were not checked fully, so I went in and fixed
a few things. Finally, the most important outcome of this patch is that
my new error handling code caught a bug in a callsite in
stackmap-format.

http://reviews.llvm.org/D6824

Files:
  lib/IR/Verifier.cpp
  test/CodeGen/X86/statepoint-call-lowering.ll
  test/CodeGen/X86/statepoint-stackmap-format.ll

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