RFR: 8371792: Refactor barrier loop tests out of TestIfMinMax [v4]

[Galder Zamarreño]

> Trivial cleanup to move tests out of a test class whose description does not match these tests

Galder Zamarreño has updated the pull request incrementally with one additional commit since the last revision:

  Update test/hotspot/jtreg/compiler/gcbarriers/TestMinMaxLongLoopBarrier.java
  
  Co-authored-by: Emanuel Peter <emanuel.peter at oracle.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28385/files
  - new: https://git.openjdk.org/jdk/pull/28385/files/278d4bce..d023353f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28385&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28385&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28385.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28385/head:pull/28385

PR: https://git.openjdk.org/jdk/pull/28385