JSObject::SetImmutableProto is called from InstantiateObject
in api/api-natives.cc:
https://source.chromium.org/chromium/chromium/src/+/master:v8/src/api/api-natives.cc;drc=98497572964c764de5dc32a54a62c66943ed8499;l=369
https://source.chromium.org/chromium/chromium/src/+/master:v8/src/api/api-natives.cc;drc=98497572964c764de5dc32a54a62c66943ed8499;l=423
So, non JS code will hit the DCHECK being removed in this patch.

Actually, Blink hits this DCHECK when implementing Location
object's [[SetPrototypeOf]] as SetImmutablePrototype.
c.f. https://crrev.com/c/2145516

Change-Id: I88b2715d645f5ea792ef33cb67a6990c762ad338
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2143982Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67171}