[regexp] Port RegExpConstructor

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 551062a8718d53eef420810233e380f71c299302..4fc3fbc282e16310da6ae8b7f6dcca8765f03621 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1575,14 +1575,23 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
 
   {  // -- R e g E x p
     // Builtin functions for RegExp.prototype.
-    Handle<JSFunction> regexp_fun =
-        InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
-                        isolate->initial_object_prototype(),
-                        Builtins::kIllegal);
+    Handle<JSFunction> regexp_fun = InstallFunction(
+        global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
+        isolate->initial_object_prototype(), Builtins::kRegExpConstructor);
     InstallWithIntrinsicDefaultProto(isolate, regexp_fun,
                                      Context::REGEXP_FUNCTION_INDEX);
-    regexp_fun->shared()->SetConstructStub(
-        *isolate->builtins()->JSBuiltinsConstructStub());
+
+    Handle<SharedFunctionInfo> shared(regexp_fun->shared(), isolate);
+    shared->SetConstructStub(*isolate->builtins()->RegExpConstructor());
+    shared->set_instance_class_name(isolate->heap()->RegExp_string());
+    shared->DontAdaptArguments();
+    shared->set_length(2);
+
+    Handle<JSObject> proto =
+        factory->NewJSObject(isolate->object_function(), TENURED);
+    JSObject::AddProperty(proto, factory->constructor_string(), regexp_fun,
+                          DONT_ENUM);
+    Accessors::FunctionSetPrototype(regexp_fun, proto).Assert();
 
     DCHECK(regexp_fun->has_initial_map());
     Handle<Map> initial_map(regexp_fun->initial_map());