R600: Move DataLayout to AMDGPUTargetMachine

This is a follow up to r227113.

It is now required to use the amdgcn target for SI and newer GPUs.

llvm-svn: 227316
diff --git a/llvm/test/CodeGen/R600/llvm.AMDGPU.class.ll b/llvm/test/CodeGen/R600/llvm.AMDGPU.class.ll
index 974e3c7..0bc7d4e 100644
--- a/llvm/test/CodeGen/R600/llvm.AMDGPU.class.ll
+++ b/llvm/test/CodeGen/R600/llvm.AMDGPU.class.ll
@@ -1,4 +1,4 @@
-; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
+; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 
 declare i1 @llvm.AMDGPU.class.f32(float, i32) #1
 declare i1 @llvm.AMDGPU.class.f64(double, i32) #1