Port and integrate the irregexp engine from V8

runtime/vm/compiler.h

Index: runtime/vm/compiler.h
diff --git a/runtime/vm/compiler.h b/runtime/vm/compiler.h
index 48af3cb3032ea953abe6c3ead0bd2b84efbd8f3f..5eec0932842cd56217dcfb2e7bb70396bf4a8796 100644
--- a/runtime/vm/compiler.h
+++ b/runtime/vm/compiler.h
@@ -13,6 +13,7 @@ namespace dart {
 
 // Forward declarations.
 class Class;
+class FlowGraph;
 class Function;
 class Library;
 class ParsedFunction;
@@ -55,6 +56,9 @@ class Compiler : public AllStatic {
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileParsedFunction(ParsedFunction* parsed_function);
 
+  static RawError* CompileIrregexpFunction(ParsedFunction* parsed_function,
+                                           FlowGraph* flow_graph);
+
   // Generates and executes code for a given code fragment, e.g. a
   // compile time constant expression. Returns the result returned
   // by the fragment.