Fix initializer for variables with attribute address_space set.

This would error in C++ mode unless the variable also had a cv
qualifier.

e.g.

__attribute__((address_space(2))) float foo = 1.0f; would error but
__attribute__((address_space(2))) const float foo = 1.0f; would not.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176121 91177308-0d34-0410-b5e6-96231b3b80d8
Fix assertion failure when a field is given an address space.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176122 91177308-0d34-0410-b5e6-96231b3b80d8