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

[Roger Riggs]

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.

src/java.base/share/classes/java/math/BigInteger.java line 1276:

> 1274:          * on demand.
> 1275:          */
> 1276:         BigInteger[][] powerCache = new BigInteger[Character.MAX_RADIX+1][];

Using a different local name will avoid the shadowing and make it more obvious that the initialization is being deliberately being done before the assignment to a volatile.

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