AMDGPU: Fix broken/confusing predefined macro

amdgcn should not be defining __R600__

llvm-svn: 262124
diff --git a/clang/test/Preprocessor/predefined-arch-macros.c b/clang/test/Preprocessor/predefined-arch-macros.c
index 668fbe8..1276ef0 100644
--- a/clang/test/Preprocessor/predefined-arch-macros.c
+++ b/clang/test/Preprocessor/predefined-arch-macros.c
@@ -1962,3 +1962,17 @@
 // RUN:   | FileCheck %s -check-prefix=CHECK_SYSTEMZ_ZVECTOR
 //
 // CHECK_SYSTEMZ_ZVECTOR: #define __VEC__ 10301
+
+// Begin amdgcn tests ----------------
+//
+// RUN: %clang -march=amdgcn -E -dM %s -o - 2>&1 \
+// RUN:     -target amdgcn-unknown-unknown \
+// RUN:   | FileCheck %s -check-prefix=CHECK_AMDGCN
+// CHECK_AMDGCN: #define __AMDGCN__ 1
+
+// Begin r600 tests ----------------
+//
+// RUN: %clang -march=amdgcn -E -dM %s -o - 2>&1 \
+// RUN:     -target r600-unknown-unknown \
+// RUN:   | FileCheck %s -check-prefix=CHECK_R600
+// CHECK_R600: #define __R600__ 1