Use a typed array for the irregexp stack.

runtime/vm/regexp_assembler.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_REGEXP_ASSEMBLER_H_
 #define VM_REGEXP_ASSEMBLER_H_
 
 #include "vm/assembler.h"
 #include "vm/intermediate_language.h"
 #include "vm/object.h"
@@ skipping 521 matching lines @@
   // Loads and binds a local variable.
   Value* BindLoadLocal(const LocalVariable& local);
 
   // Appends the definition.
   void Do(Definition* definition);
   // Closes the current block with a jump to the specified block.
   void GoTo(JoinEntryInstr* to);
 
   // Accessors for our local stack_.
   void PushStack(Definition* definition);
-  Value* PopStack();
+  Definition* PopStack();
+  Definition* PeekStack();
+  void CheckStackLimit();
+  void GrowStack();
 
   // Prints the specified argument. Used for debugging.
   void Print(PushArgumentInstr* argument);
 
   // A utility class tracking ids of various objects such as blocks, temps, etc.
   class IdAllocator : public ValueObject {
    public:
     IdAllocator() : next_id(0) { }
 
     intptr_t Count() const { return next_id; }
@@ skipping 35 matching lines @@
   // All created blocks are contained within this set. Used for printing
   // the generated code.
   GrowableArray<BlockEntryInstr*> blocks_;
 
   // The current instruction to link to when new code is emitted.
   Instruction* current_instruction_;
 
   // A list, acting as the runtime stack for both backtrack locations and
   // stored positions within the string.
   LocalVariable* stack_;
+  LocalVariable* stack_pointer_;
 
   // Stores the current character within the string.
   LocalVariable* current_character_;
 
   // Stores the current location within the string as a negative offset
   // from the end of the string.
   LocalVariable* current_position_;
 
   // The string being processed, passed as a function parameter.
   LocalVariable* string_param_;
@@ skipping 14 matching lines @@
   LocalVariable* index_temp_;
 
   LocalVariable* result_;
 
   // Stored positions containing group bounds. Generated as needed.
   LocalVariable* registers_;
   intptr_t registers_count_;
   const intptr_t saved_registers_count_;
 
   // The actual array objects used for the stack and registers.
-  GrowableObjectArray& stack_array_;
+  Array& stack_array_cell_;
   TypedData& registers_array_;
 
   IdAllocator block_id_;
   IdAllocator temp_id_;
   IdAllocator arg_id_;
   IdAllocator local_id_;
   IdAllocator indirect_id_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_REGEXP_ASSEMBLER_H_