cppgc: Fix name trait for gcc and msvc

The configuration was only enabled behind
  `cppgc_enable_object_names = true`

Bug: chromium:1321620
Change-Id: Id762a0603e6788ad218cc367b44c71a5c0f48e95
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3769827
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81769}

include/cppgc/internal/name-trait.h

@@ -116,7 +116,7 @@ class NameTrait final : public NameTraitBase {
 
     static const HeapObjectName leaky_name =
         GetNameFromTypeSignature(PRETTY_FUNCTION_VALUE);
-    return {leaky_name, false};
+    return leaky_name;
 
 #undef PRETTY_FUNCTION_VALUE