Get rid of the ZoneScopeMode.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 423 matching lines @@
 };
 
 
 // Exactly like a CompilationInfo, except also creates and enters a
 // Zone on construction and deallocates it on exit.
 class CompilationInfoWithZone: public CompilationInfo {
  public:
   explicit CompilationInfoWithZone(Handle<Script> script)
       : CompilationInfo(script, &zone_, &phase_zone_),
         zone_(script->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(script->GetIsolate()) {}
   explicit CompilationInfoWithZone(Handle<SharedFunctionInfo> shared_info)
       : CompilationInfo(shared_info, &zone_, &phase_zone_),
         zone_(shared_info->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(shared_info->GetIsolate()) {}
   explicit CompilationInfoWithZone(Handle<JSFunction> closure)
       : CompilationInfo(closure, &zone_, &phase_zone_),
         zone_(closure->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(closure->GetIsolate()) {}
   CompilationInfoWithZone(HydrogenCodeStub* stub, Isolate* isolate)
       : CompilationInfo(stub, isolate, &zone_, &phase_zone_),
         zone_(isolate),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(isolate) {}
 
   // Virtual destructor because a CompilationInfoWithZone has to exit the
   // zone scope and get rid of dependent maps even when the destructor is
   // called when cast as a CompilationInfo.
   virtual ~CompilationInfoWithZone() {
     RollbackDependentMaps();
   }
 
  private:
@@ skipping 182 matching lines @@
   unsigned start_allocation_size_;
   int64_t start_ticks_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_