[AMDGPU] Change constant addr space to 4

Differential Revision: https://reviews.llvm.org/D43170

llvm-svn: 325030
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index c3e96f9..38b72c3 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -929,7 +929,7 @@
   AMDGPUAS AS;
   AS.FLAT_ADDRESS = 0;
   AS.PRIVATE_ADDRESS = 5;
-  AS.REGION_ADDRESS = 4;
+  AS.REGION_ADDRESS = 2;
   return AS;
 }