[AMDGPU] Fix pointer info for pseudo source for r600

The pointer info for pseudo source for r600 is not correct when
alloca addr space is not 0, which causes invalid SDNode for r600---amdgiz.

This patch fixes that.

Differential Revision: https://reviews.llvm.org/D39670


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317861 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed