[PATCH] Reject bitcasts between address spaces with different sizes

[Matt Arsenault]

  Use visited set in other place

Hi eli.friedman,

http://llvm-reviews.chandlerc.com/D1083

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1083?vs=2961&id=3016#toc

Files:
  docs/LangRef.rst
  lib/IR/Verifier.cpp
  test/Verifier/bitcast-address-space-nested-global-cycle.ll
  test/Verifier/bitcast-address-space-nested-global.ll
  test/Verifier/bitcast-address-space-through-constant-inttoptr-inside-gep-instruction.ll
  test/Verifier/bitcast-address-space-through-constant-inttoptr.ll
  test/Verifier/bitcast-address-space-through-gep-2.ll
  test/Verifier/bitcast-address-space-through-gep.ll
  test/Verifier/bitcast-address-space-through-inttoptr.ll
  test/Verifier/bitcast-address-spaces.ll
  test/Verifier/bitcast-vector-pointer-as.ll
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