[15] RFR: 8246662: Test java/time/test/java/time/format/TestUnicodeExtension.java failed on japanese locale.

[naoto.sato at oracle.com]

Hello,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8246662

The proposed changeset is located at:

https://cr.openjdk.java.net/~naoto/8246662/webrev.00/

This is a regression caused by the fix to JDK-8244245, where the locale 
related fields in the formatter are now overridden by localizedBy() 
method. It was only comparing the locale object for the fast path, but 
it was not sufficient.

Naoto