[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.

I have consulted Coleen on JBS if there's any risk to bring her patch to jdk17. 
Meanwhile, I split JDK-8269064 into the urgent(https://github.com/openjdk/jdk17/pull/121) one and not so urgent one.  The later depends on this PR.

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