RFR: 8316967: Correct the scope of vmtimer in UnregisteredClasses::load_class [v3]

[Calvin Cheung]

On Mon, 16 Oct 2023 21:10:10 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Should these be removed as well?
> 
> ```
> ./share/classfile/classLoader.cpp:PerfCounter*    ClassLoader::_perf_sys_class_lookup_time = nullptr;
> ./share/classfile/classLoader.cpp:    NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
> ./share/classfile/classLoader.hpp:  static PerfCounter* _perf_sys_class_lookup_time;
> ```

I've pushed another commit to remove those.
Re-running tier1 tests.

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PR Comment: https://git.openjdk.org/jdk/pull/16046#issuecomment-1765309430