RFR: 8293630: Simplify TreeMap.get() with Comparator.naturalOrder()

Mon Sep 12 09:40:18 UTC 2022

We can use `Comparator.naturalOrder()` for cases when a `TreeMap` instance is constructed without comparator. This allows to squash two branches in `TreeMap.get()` into one.

P.S. I think the comment of `TreeMap.getEntryUsingComparator()` is outdated. Should we also change it?

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Commit messages:
 - Merge remote-tracking branch 'origin/tree-map-simpl' into tree-map-simpl
 - Simplify TreeMap.get() with Comparator.naturalOrder()
 - Merge branch 'master' into tree-map-simpl
 - Simplify TreeMap.get() with Comparator.naturalOrder()

Changes: https://git.openjdk.org/jdk/pull/9901/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9901&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293630
  Stats: 45 lines in 1 file changed: 6 ins; 22 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/9901.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9901/head:pull/9901

PR: https://git.openjdk.org/jdk/pull/9901