RFR: 8370653: Fix race in CompressedClassSpaceSizeInJmapHeap.java

[Kelvin Nilsen]

Retry heap-dump request if first attempts fail (typically due to race).

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Commit messages:
 - Use camel case spelling for Java variable names
 - retry failed attach in CompressedClassSpaceSizeInJmapHeap.java
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - ... and 38 more: https://git.openjdk.org/jdk/compare/910bb68e...0ccd12ae

Changes: https://git.openjdk.org/jdk/pull/28070/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28070&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370653
  Stats: 15 lines in 1 file changed: 8 ins; 3 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/28070.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28070/head:pull/28070

PR: https://git.openjdk.org/jdk/pull/28070