RFR: 8290079: Reduce interaction with volatile in static initializer of BigInteger

[Raffaello Giulietti]

On Mon, 11 Jul 2022 12:41:48 GMT, Сергей Цыпанов <duke at openjdk.org> wrote:

> `BigInteger.powerCache` is volatile and should be assigned only once in static initializer.

Usually yes, but since a static initializer is executed by at most one thread by using a locking protocol before any other static code is ever executed, the runtime _could_ (but I'm not sure it it really does) treat the volatile in the for loop as a local.
But I would approve your change because it makes this more explicit.

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PR: https://git.openjdk.org/jdk/pull/9451