[turbofan] Reserve the StateValueList's size before filling it

src/compiler/instruction.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 1179 matching lines @@
     friend class StateValueList;
 
     iterator(ZoneVector<StateValueDescriptor>::iterator it,
              ZoneVector<StateValueList*>::iterator nested)
         : field_iterator(it), nested_iterator(nested) {}
 
     ZoneVector<StateValueDescriptor>::iterator field_iterator;
     ZoneVector<StateValueList*>::iterator nested_iterator;
   };
 
+  void ReserveSize(size_t size) { fields_.reserve(size); }
+
   StateValueList* PushRecursiveField(Zone* zone, size_t id) {
     fields_.push_back(StateValueDescriptor::Recursive(id));
     StateValueList* nested =
         new (zone->New(sizeof(StateValueList))) StateValueList(zone);
     nested_.push_back(nested);
     return nested;
   }
   void PushDuplicate(size_t id) {
     fields_.push_back(StateValueDescriptor::Duplicate(id));
   }
@@ skipping 392 matching lines @@
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(
     std::ostream& os, const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_