[regexp] Add fast-path for global, callable replace

src/string-builder.h

Index: src/string-builder.h
diff --git a/src/string-builder.h b/src/string-builder.h
index a37630131e07b0263b506c1dac9fae407a3897a9..edc6476a45a3518ff32e2a6c69c9428111667bcf 100644
--- a/src/string-builder.h
+++ b/src/string-builder.h
@@ -174,6 +174,11 @@ class FixedArrayBuilder {
 
   int capacity() { return array_->length(); }
 
+  Handle<JSArray> ToJSArray(Handle<JSArray> target_array) {
+    JSArray::SetContent(target_array, array_);
+    target_array->set_length(Smi::FromInt(length_));
+    return target_array;
+  }
 
  private:
   Handle<FixedArray> array_;