R600: Handle amdgcn triple

For now there is no difference between amdgcn and r600.

llvm-svn: 225294
diff --git a/clang/test/CodeGenOpenCL/amdgpu-num-gpr-attr.cl b/clang/test/CodeGenOpenCL/amdgpu-num-gpr-attr.cl
index c89a209..35bdcea 100644
--- a/clang/test/CodeGenOpenCL/amdgpu-num-gpr-attr.cl
+++ b/clang/test/CodeGenOpenCL/amdgpu-num-gpr-attr.cl
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple r600-- -target-cpu tahiti -O0 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple amdgcn-- -target-cpu tahiti -O0 -emit-llvm -o - %s | FileCheck %s
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -O0 -emit-llvm -verify -o - %s | FileCheck -check-prefix=X86 %s
 
 // Make sure this is silently accepted on other targets.