Introduce a class to carry around a deoptimization reason.

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 ca8c563029152f4b3713cb2e020a2518fddd54f5..f46ba7671d654b273fc50c8f59a2fe33c6788112 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -235,9 +235,9 @@ class LCodeGen: public LCodeGenBase {
   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                             Safepoint::DeoptMode mode);
   void DeoptimizeIf(Condition condition, LInstruction* instr,
-                    const char* reason, Deoptimizer::BailoutType bailout_type);
+                    const char* detail, Deoptimizer::BailoutType bailout_type);
   void DeoptimizeIf(Condition condition, LInstruction* instr,
-                    const char* reason = NULL);
+                    const char* detail = NULL);
 
   void AddToTranslation(LEnvironment* environment,
                         Translation* translation,