[AMDGPU] Change alloca addr space of r600 to 5 for amdgiz environment

Differential Revision: https://reviews.llvm.org/D39657


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317479 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed