Port irregexp bytecode compiler and interpreter from V8 r24065.

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 5721a0b904e632b050dbc08a47e1cd78d35ce7b3..cc967e703482a89e306f3ff0587d42f1477a3597 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -1904,10 +1904,14 @@ class RawJSRegExp : public RawInstance {
   RawFunction* two_byte_function_;
   RawFunction* external_one_byte_function_;
   RawFunction* external_two_byte_function_;
+  RawTypedData* one_byte_bytecode_;
+  RawTypedData* two_byte_bytecode_;
   RawObject** to() {
-    return reinterpret_cast<RawObject**>(&ptr()->external_two_byte_function_);
+    return reinterpret_cast<RawObject**>(&ptr()->two_byte_bytecode_);
   }
 
+  intptr_t num_registers_;
+
   // A bitfield with two fields:
   // type: Uninitialized, simple or complex.
   // flags: Represents global/local, case insensitive, multiline.