the problem is that we call irregexp code in two ways:

1. CallCFunction9 from CSA builtins
2. Through GeneratedCode::Call from the runtime.

1 is a standard C call and expects the target to be a FD,
2 is our own implementation where we dynamically generate a FD.
So there's a mismatch between the two.

Change-Id: I8391db30fa7586d296b5d1880a7f44dafad21a2a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1487341
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Auto-Submit: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60129}