Emit comment with instruction+reason before deopt calls.

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index fc609160a0bcae915ab69ad3456611feba0b2518..a08768c0dfcce7c1b428793e0d93c6ac63f62c2a 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -235,8 +235,9 @@ class LCodeGen: public LCodeGenBase {
   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                             Safepoint::DeoptMode mode);
   void DeoptimizeIf(Condition condition, LInstruction* instr,
-                    Deoptimizer::BailoutType bailout_type);
-  void DeoptimizeIf(Condition condition, LInstruction* instr);
+                    const char* reason, Deoptimizer::BailoutType bailout_type);
+  void DeoptimizeIf(Condition condition, LInstruction* instr,
+                    const char* reason = NULL);
 
   void AddToTranslation(LEnvironment* environment,
                         Translation* translation,