Some new regexp infrastructure.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index d331d73c45a09c6e70135d7025c9112b6cac8149..e572ac2832af10f7e10e418fb1d2af47de917632 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -144,6 +144,8 @@ FunctionLiteral* MakeAST(bool compile_in_global_context,
 ScriptDataImpl* PreParse(unibrow::CharacterStream* stream,
                          v8::Extension* extension);
 
+RegExpTree* ParseRegExp(unibrow::CharacterStream* stream,
+                        Handle<String>* error);
 
 // Support for doing lazy compilation. The script is the script containing full
 // source of the script where the function is declared. The start_position and