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 3be710beedea8b3b76b12beac63e99e20fa76984..12104f1f4c9651c1d47df4a6de3647e7a201e8b6 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.