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

[Ioi Lam]

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

> We might want to share other hashtables like this, like the loader constraint table, but I don't think this will be needed.

CDS used to use Hashtable to store stuff into the archive. It doesn't do that anymore, and has switched to CompactHashtable. So the "shared entry" support in Hashtable can be safely deleted.

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