RFR: 8267089: Use typedef KVHashtable for ID2KlassTable [v2]

[Yi Yang]

On Mon, 17 May 2021 06:00:33 GMT, Yi Yang <yyang at openjdk.org> wrote:

>> While backporting some stuff to jdk11, I noticed main functionalities of ID2KlassTable have been removed afterJDK-8213587, it seems that we can use a simple typedef KVHashtable instead.
>
> Yi Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   ID2KlassTable* instead of ID2KlassTable *

Thank Xin and Ioi for taking time to look at this PR!

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PR: https://git.openjdk.java.net/jdk/pull/4007