test: add not-called check to heap-profiler test

Add `common.mustNotCall()` to make sure there aren't any strange
shenanians in the C++ test that would cause the function to execute when
it shouldn't.

PR-URL: #12985
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/addons/heap-profiler/test.js

@@ -5,7 +5,7 @@ const common = require('../../common');
 const binding = require(`./build/${common.buildType}/binding`);
 
 // Create an AsyncWrap object.
-const timer = setTimeout(function() {}, 1);
+const timer = setTimeout(common.mustNotCall(), 1);
 timer.unref();
 
 // Stress-test the heap profiler.