RFR: 8261998: Remove unused shared entry support from utilities/hashtable

[Kim Barrett]

On Fri, 19 Feb 2021 02:56:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this small cleanup in the utilities/hashtable facility.  The
>> support for "shared" entries is no longer needed or used, so is being deleted.
>> 
>> Testing:
>> mach5 tier1-4 (some CDS tests are in tier4)
>
> We might want to share other hashtables like this, like the loader constraint table, but I don't think this will be needed.

Thanks @coleenp and @iklam for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/2638