OpenCL: Add -ffake-address-space-map to a test

The ensures there is an explicit address space id in the output.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219928 91177308-0d34-0410-b5e6-96231b3b80d8
OpenCL: Emit global variables in the constant addr space as constant globals

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219929 91177308-0d34-0410-b5e6-96231b3b80d8