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

[Ioi Lam]

On Fri, 19 Feb 2021 02:39:20 GMT, Kim Barrett <kbarrett 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)

Marked as reviewed by iklam (Reviewer).

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