RFR: JDK-8272318: Improve performance of HeapDumpAllTest

[Ralf Schmelter]

On Wed, 11 Aug 2021 19:19:51 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Is there a reason you don't want this change to also apply to HeapDumpTest?

Since the GC.heap_dump already does a GC it is not really needed. Of course doing the gc in HeapDumpTest is a smaller change, so I'm open for that.

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PR: https://git.openjdk.java.net/jdk/pull/5084