RFR: 8288628: Unnecessary Hashtable usage in ConditionalSpecialCasing

[Naoto Sato]

On Wed, 15 Jun 2022 19:49:52 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> If a thread-safe implementation is not needed, it is recommended to use HashMap in place of Hashtable.
> `ConditionalSpecialCasing.entryTable` is read-only Map which is modified only in `static` block. It means we can safely replace it with HashMap.

Looks good.
I would have refactored the initialization of the static map itself, but it would be for another day.

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Marked as reviewed by naoto (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9172