R600/SI: Add preliminary support for flat address space

llvm-svn: 217777
diff --git a/llvm/lib/Target/R600/SIDefines.h b/llvm/lib/Target/R600/SIDefines.h
index 7679bee..0a24737 100644
--- a/llvm/lib/Target/R600/SIDefines.h
+++ b/llvm/lib/Target/R600/SIDefines.h
@@ -22,7 +22,8 @@
   VOPC = 1 << 8,
   SALU = 1 << 9,
   MUBUF = 1 << 10,
-  MTBUF = 1 << 11
+  MTBUF = 1 << 11,
+  FLAT = 1 << 12
 };
 }