[PATCH] Canonicalize addrspacecast ConstExpr between different pointer types

[Jingyue Wu]

make the test @ld_int_from_float more explicit

http://reviews.llvm.org/D4138

Files:
  lib/IR/ConstantFold.cpp
  lib/IR/Constants.cpp
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  test/Assembler/addrspacecast-alias.ll
  test/CodeGen/NVPTX/access-non-generic.ll
  test/Other/constant-fold-gep.ll
  test/Transforms/InstCombine/constant-fold-address-space-pointer.ll
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