RFR: 8297750: Unnecessary Vector usage in IIORegistry

[Phil Race]

On Sun, 27 Nov 2022 17:51:15 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Field `javax.imageio.spi.IIORegistry#initialCategories` is modified only in `static {}` block, which makes it effectively final. Instead of legacy synchronized `Vector` we can use non-threadsafe `ArrayList` here.

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11379