runtime: don't panic in castogscanstatus

runtime: don't panic in castogscanstatus

The panic calls gopanic which may have write barriers, but
castogscanstatus is called from //go:nowritebarrier contexts.

The panic is dead code anyway, and appears immediately before a call to
'throw'.

Change-Id: I4a8e296b71bf002295a3aa1db4f723c305ed939a
Reviewed-on: https://go-review.googlesource.com/c/go/+/717406
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>