runtime: fix stack split at bad time when fuzzing
runtime: fix stack split at bad time when fuzzing

Fix #53190

Change-Id: I6c1f9c3ab58818d3a9f05ddaa02fc247e53677d3
GitHub-Last-Rev: 13b0749c135598c97063b07e2b0266125f5da83e
GitHub-Pull-Request: golang/go#53191
Reviewed-on: https://go-review.googlesource.com/c/go/+/410034
Reviewed-by: Michael Knyszek <4473450dc5c88f06e1fb787f303d7805ec2aee65@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>

nawawi/go,golang/go,golang/go,nawawi/go,golang/go,golang/go,nawawi/go,nawawi/go,golang/go,nawawi/go,nawawi/go,nawawi/go,golang/go,nawawi/go,golang/go,golang/go