Can I please get a review for this proposed fix for 
https://bugs.openjdk.java.net/browse/JDK-8262108?

As noted in a comment in that issue, the bug relates to the return value of 
`Calendar.getDisplayNames` for the `Calendar.AM_PM` field. The implementation 
has started returning invalid values for the `AM_PM` field after the "day 
period" support was added recently in the JDK as part of 
https://bugs.openjdk.java.net/browse/JDK-8262108.

The commit here adds a check in the internal implementation of the display name 
handling logic, to special case the `AM_PM` field and properly convert the 
display name array indexes (which is an internal detail) to valid values that 
represent the `AM_PM` calendar field.

The commit also has a new jtreg test case `CalendarDisplayNamesTest` reproduces 
this issue and verifies the fix.

After this fix was introduced, I ran the test in `test/jdk/java/util/Calendar/` 
and that showed up a failure in an existing test case `NarrowNamesTest`. 
Looking at that test case, IMO, the current testing in that `NarrowNamesTest` 
is incorrect and is probably what hid this issue in the first place? To fix 
this, I have added an additional commit which updates this test case to 
properly test the `AM_PM` field values.

-------------

Commit messages:
 - Fix test that now fails after fixing 8262108
 - 8262108: SimpleDateFormat formatting broken for sq_MK Locale

Changes: https://git.openjdk.java.net/jdk/pull/3463/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3463&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262108
  Stats: 117 lines in 3 files changed: 97 ins; 1 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3463.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3463/head:pull/3463

PR: https://git.openjdk.java.net/jdk/pull/3463

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