AMDGPU: Remove remnants of old address space mapping

llvm-svn: 341165
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
index 8e63d78..397c5c6 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
@@ -179,7 +179,7 @@
     if (IsGraphicsShader)
       return -1;
     return ST->hasFlatAddressSpace() ?
-      ST->getAMDGPUAS().FLAT_ADDRESS : ST->getAMDGPUAS().UNKNOWN_ADDRESS_SPACE;
+      AMDGPUAS::FLAT_ADDRESS : AMDGPUAS::UNKNOWN_ADDRESS_SPACE;
   }
 
   unsigned getVectorSplitCost() { return 0; }