runtime: convert panicking to atomic type

For #53821.

Change-Id: I93409f377881a3c029b41b0f1fbcef5e21091f2f
Reviewed-on: https://go-review.googlesource.com/c/go/+/419438
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index 33219419f9..33d7d6f552 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -265,7 +265,7 @@ func main() {
 			Gosched()
 		}
 	}
-	if atomic.Load(&panicking) != 0 {
+	if panicking.Load() != 0 {
 		gopark(nil, nil, waitReasonPanicWait, traceEvGoStop, 1)
 	}
 
@@ -5016,7 +5016,7 @@ func checkdead() {
 	// freezetheworld will cause all running threads to block.
 	// And runtime will essentially enter into deadlock state,
 	// except that there is a thread that will call exit soon.
-	if panicking > 0 {
+	if panicking.Load() > 0 {
 		return
 	}