RFR: 8355391: Use Double::hashCode in java.util.Locale::hashCode

[Chen Liang]

On Wed, 30 Apr 2025 18:01:08 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> Similar to #24959, java.util.Locale.hashCode can also make the same improvement.
> 
> Replace manual bitwise operations in hashCode implementations of java.util.Locale with Double::hashCode.

src/java.base/share/classes/java/util/Locale.java line 3500:

> 3498:                 h = 17;
> 3499:                 h = 37*h + range.hashCode();
> 3500:                 h = 37*h + Long.hashCode(Double.doubleToLongBits(weight));

Suggestion:

                h = 37*h + Double.hashCode(weight);

These are equivalent.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24971#discussion_r2069218063