RFR: 8277868: Use Comparable.compare() instead of surrogate code [v4]

[Сергей Цыпанов]

> Instead of something like
> 
> long x;
> long y;
> return (x < y) ? -1 : ((x == y) ? 0 : 1);
> 
> we can use `return Long.compare(x, y);`
> 
> All replacements are done with IDE.

Сергей Цыпанов has updated the pull request incrementally with two additional commits since the last revision:

 - 8277868: Revert irrelevant changes
 - 8277868: Inline local vars

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6575/files
  - new: https://git.openjdk.java.net/jdk/pull/6575/files/1b3a5d4b..bb06bf2f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6575&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6575&range=02-03

  Stats: 9 lines in 3 files changed: 0 ins; 3 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6575.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6575/head:pull/6575

PR: https://git.openjdk.java.net/jdk/pull/6575