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/global-extload-i8.ll b/llvm/test/CodeGen/R600/global-extload-i8.ll
index 8624523..4c37f3f 100644
--- a/llvm/test/CodeGen/R600/global-extload-i8.ll
+++ b/llvm/test/CodeGen/R600/global-extload-i8.ll
@@ -1,5 +1,5 @@
-; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
-; RUN: llc -march=r600 -mcpu=tonga -verify-machineinstrs< %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs< %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
 ; RUN: llc -march=r600 -mcpu=cypress < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
 
 ; FUNC-LABEL: {{^}}zextload_global_i8_to_i32: