[jdk17] RFR: 8267752: KVHashtable doesn't deallocate entries

[Xin Liu]

On Mon, 21 Jun 2021 18:08:48 GMT, Xin Liu <xliu at openjdk.org> wrote:

> Add a free_entry iteration to the destructor of ~KVHashtables.
> Tested with tier1-3.

hi, @coleenp 

[JDK-8269064](https://bugs.openjdk.java.net/browse/JDK-8269064) depends on this [JDK-8267752](https://bugs.openjdk.java.net/browse/JDK-8267752).  I think JDK-8267752 itself is also worthy in jdk17. 

ctx:
https://github.com/openjdk/jdk/pull/4537#event-4918066602 

Could you take a look at it?

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PR: https://git.openjdk.java.net/jdk17/pull/110