GCC optimizes away things like ptr < NULL to false. To "fix" this,
have the CBE emit casts of pointers to intptr_t when doing relational
pointer comparisons.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41983 91177308-0d34-0410-b5e6-96231b3b80d8