Fix cpplint whitespace/braces issues

Change-Id: Ide80939faf8e8690d8842dde8133902ac725ed1a
diff --git a/runtime/dex_instruction.h b/runtime/dex_instruction.h
index d2ad989..c3424dc 100644
--- a/runtime/dex_instruction.h
+++ b/runtime/dex_instruction.h
@@ -82,7 +82,7 @@
   // TODO: the code layout below is deliberate to avoid this enum being picked up by
   //       generate-operator-out.py.
   enum Code
-  {
+  { // NOLINT(whitespace/braces)
 #define INSTRUCTION_ENUM(opcode, cname, p, f, r, i, a, v) cname = opcode,
 #include "dex_instruction_list.h"
     DEX_INSTRUCTION_LIST(INSTRUCTION_ENUM)