Revert "AMDGPU: bump AS.MAX_COMMON_ADDRESS to 6 since 32-bit addr space"

As it introduces out of bound access.

This reverts commit r340172 and r340171

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340202 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed