RFR: 8304846: Provide a shared utility to dump generated classes defined via Lookup API [v2]

[Mandy Chung]

On Fri, 24 Mar 2023 20:54:25 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   avoid another map lookup
>
> src/java.base/share/classes/java/lang/invoke/ClassFileDumper.java line 88:
> 
>> 86:                 dir = validateDumpDir(Path.of(path.trim()));
>> 87:             }
>> 88:             DUMPER_MAP.putIfAbsent(key, new ClassFileDumper(key, dir));
> 
> Can just return `putIfAbsent` result to avoid another map lookup

This is not performance critical.  I updated it anyway.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13182#discussion_r1148129324