runtime: make sure to properly park before going to sleep in Windows ConsoleControlHandler

This change avoids the program intermittently hanging on windows/arm64 after getting
a signal for which the ConsoleControlHandler can not return.

Fixes #49458

Change-Id: Ie28f0f437c7e0f9634b6b3e29dc6cdebd5d996f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/364556
Trust: Patrik Nyblom <[email protected]>
Trust: Dan Scales <[email protected]>
Run-TryBot: Patrik Nyblom <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
TryBot-Result: Go Bot <[email protected]>

Author: bufflig

src/runtime/os_windows.go

@@ -1194,8 +1194,10 @@ func ctrlHandler(_type uint32) uintptr {
 	if sigsend(s) {
 		if s == _SIGTERM {
 			// Windows terminates the process after this handler returns.
-			// Block indefinitely to give signal handlers a chance to clean up.
-			stdcall1(_Sleep, uintptr(_INFINITE))
+			// Block indefinitely to give signal handlers a chance to clean up,
+			// but make sure to be properly parked first, so the rest of the
+			// program can continue executing.
+			block()
 		}
 		return 1
 	}