runtime: hold sched.lock over globrunqputbatch in runqputbatch

globrunqputbatch should never be called without sched.lock held.
runqputbatch's documentation even says it may acquire sched.lock in
order to call it.

Fixes #40457.

Change-Id: I5421b64f1da3a6087dfebbef7203db0c95d213a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/245377
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/proc.go

@@ -5225,7 +5225,9 @@ func runqputbatch(pp *p, q *gQueue, qsize int) {
 
 	atomic.StoreRel(&pp.runqtail, t)
 	if !q.empty() {
+		lock(&sched.lock)
 		globrunqputbatch(q, int32(qsize))
+		unlock(&sched.lock)
 	}
 }