[11u] RFR: 8227127: Era designator not displayed correctly using the COMPAT provider

[Severin Gehwolf]

Hi,

Could I please get a review of this 11u backport? The JDK 14 patch
doesn't apply as is due to JDK-8221432 (CLDR data update) not being
present. I've fixed LocaleDataTest.java's @bug line manually. Otherwise
the patch is the same.

Bug: https://bugs.openjdk.java.net/browse/JDK-8227127
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8227127/01/webrev/

Testing: tier1 and manual test from the bug on Linux x86_64.

Thanks,
Severin