Emit comment with instruction+reason before deopt calls.

src/x87/lithium-codegen-x87.h

Index: src/x87/lithium-codegen-x87.h
diff --git a/src/x87/lithium-codegen-x87.h b/src/x87/lithium-codegen-x87.h
index ca2179aab60e662fbc6f2e1760855fe446769398..080a468292a710d48853ea1c6a0602fe7919ce01 100644
--- a/src/x87/lithium-codegen-x87.h
+++ b/src/x87/lithium-codegen-x87.h
@@ -234,9 +234,10 @@ class LCodeGen: public LCodeGenBase {
 
   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                             Safepoint::DeoptMode mode);
-  void DeoptimizeIf(Condition cc, LInstruction* instr,
+  void DeoptimizeIf(Condition cc, LInstruction* instr, const char* reason,
                     Deoptimizer::BailoutType bailout_type);
-  void DeoptimizeIf(Condition cc, LInstruction* instr);
+  void DeoptimizeIf(Condition cc, LInstruction* instr,
+                    const char* reason = NULL);
 
   bool DeoptEveryNTimes() {
     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();