src: modernize likely/unlikely hints

PR-URL: #55155
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

Author: anonrig

.cpplint

@@ -1,3 +1,3 @@
 set noparent
-filter=-build/include_alpha,-build/include_subdir,-build/include_what_you_use,-legal/copyright,-readability/nolint
+filter=-build/include_alpha,-build/include_subdir,-build/include_what_you_use,-legal/copyright,-readability/nolint,-readability/braces
 linelength=80

src/api/callback.cc

@@ -74,7 +74,7 @@ InternalCallbackScope::InternalCallbackScope(Environment* env,
   // We first check `env->context() != current_context` because the contexts
   // likely *are* the same, in which case we can skip the slightly more
   // expensive Environment::GetCurrent() call.
-  if (UNLIKELY(env->context() != current_context)) {
+  if (env->context() != current_context) [[unlikely]] {
     CHECK_EQ(Environment::GetCurrent(isolate), env);
   }