cmd/compile: activate revert switch for late call expansion regression

cmd/compile: activate revert switch for late call expansion regression

Not a fix, but things will work while I fix it.
Credit @andybons "for we revert switches for scary stuff".

Updates #41736

Change-Id: I55f90860eae919765aac4f6d9f108a54139027e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/258897
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>