RFR: JDK-8267163: Rename anonymous loader tests to hidden loader tests [v2]

[Mikhailo Seledtsov]

On Mon, 20 Sep 2021 17:38:22 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> Please review this simple change that renames vm/mlvm tests and test package name from anonymous to hidden.
>> Testing:
>>   Ran open/test/hotspot/jtreg/vmTestbase/vm/mlvm on MacOS-x64: PASS
>>   Running open/test/hotspot/jtreg/vmTestbase/vm/mlvm on multiple platforms: in progress ...
>
> Mikhailo Seledtsov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updated problem list for Xcomp

I discovered that I had to update ProblemList-Xcomp, it is a trivial renaming for problem listed test.

David, Harold, thank you for review. All testing passed.

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PR: https://git.openjdk.java.net/jdk/pull/5570