Use a typed array for the irregexp stack.

runtime/vm/regexp.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_H_
 #define VM_REGEXP_H_
 
 #include "vm/assembler.h"
 #include "vm/intermediate_language.h"
+#include "vm/flow_graph_compiler.h"
 #include "vm/object.h"
 #include "vm/regexp_assembler.h"
 
 namespace dart {
 
 class NodeVisitor;
 class RegExpCompiler;
 class RegExpMacroAssembler;
 class RegExpNode;
 class RegExpTree;
@@ skipping 1385 matching lines @@
       const String& pattern,
       bool multi_line,
       bool ignore_case);
 
   static void DotPrint(const char* label, RegExpNode* node, bool ignore_case);
 };
 
 }  // namespace dart
 
 #endif  // VM_REGEXP_H_