RFR: 8346688: GenShen: Missing metadata trigger log message

[William Kemper]

On Thu, 19 Dec 2024 23:08:19 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The generational mode may trigger a global collection when metaspace is exhausted. When this happens, it should log this trigger as the reason for starting a cycle.

The failing tests are mentioned in the comment, but for posterity and specificity, they were:
* vmTestbase/metaspace/gc/watermark_0_1/TestDescription.java 
* vmTestbase/metaspace/gc/watermark_10_20/TestDescription.java 
* vmTestbase/metaspace/gc/watermark_70_80/TestDescription.java

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PR Comment: https://git.openjdk.org/jdk/pull/22838#issuecomment-2557434836