assert: prefer reference comparison over string comparison

Pointer comparison takes constant time and string comparison takes
linear time unless there is some string interning going on, so this
might be a little bit faster.

Signed-off-by: Darshan Sen <darshan.sen@postman.com>

PR-URL: #41015
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>

lib/assert.js

@@ -831,7 +831,7 @@ function expectsError(stackStartFn, actual, error, message) {
       details += ` (${error.name})`;
     }
     details += message ? `: ${message}` : '.';
-    const fnType = stackStartFn.name === 'rejects' ? 'rejection' : 'exception';
+    const fnType = stackStartFn === assert.rejects ? 'rejection' : 'exception';
     innerFail({
       actual: undefined,
       expected: error,
@@ -878,7 +878,7 @@ function expectsNoError(stackStartFn, actual, error, message) {
 
   if (!error || hasMatchingError(actual, error)) {
     const details = message ? `: ${message}` : '.';
-    const fnType = stackStartFn.name === 'doesNotReject' ?
+    const fnType = stackStartFn === assert.doesNotReject ?
       'rejection' : 'exception';
     innerFail({
       actual,
@@ -998,7 +998,7 @@ function internalMatch(string, regexp, message, fn) {
       'regexp', 'RegExp', regexp
     );
   }
-  const match = fn.name === 'match';
+  const match = fn === assert.match;
   if (typeof string !== 'string' ||
       RegExpPrototypeTest(regexp, string) !== match) {
     if (message instanceof Error) {