[PATCH] Canonicalize addrspacecast ConstExpr between different pointer types

[Jingyue Wu]

Hi arsenm, eliben, meheff,

As a follow-up to r210375 which canonicalizes addrspacecast
instructions, this patch canonicalizes addrspacecast constant
expressions.

Given clang uses ConstantExpr::getAddrSpaceCast to emit addrspacecast
cosntant expressions, this patch is also a step towards having the
frontend emit canonicalized addrspacecasts.

Update three affected tests in addrspacecast-alias.ll,
access-non-generic.ll and constant-fold-gep.ll and added one new test in
constant-fold-address-space-pointer.ll

http://reviews.llvm.org/D4138

Files:
  lib/IR/ConstantFold.cpp
  lib/IR/Constants.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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