RFR: 8273144: Remove unused top level "Sample Collection Set Candidates" logging [v3]

[Thomas Schatzl]

> Hi all,
> 
>   please review this trivial(?) removal of a log message and associated unused code.
> 
> This is a leftover from JDK-8017163 and the merge with the BatchedGangTask API (there is a "Sample CSet Candidates" log which is used in post evacuation phase 2).
> 
> Testing: changed TestGCLogMessages test case, compilation
> 
> Thanks,
>   Thomas

Thomas Schatzl has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5304/files
  - new: https://git.openjdk.java.net/jdk/pull/5304/files/7241cfc9..09d86250

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5304&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5304&range=01-02

  Stats: 67 lines in 1 file changed: 25 ins; 38 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5304.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5304/head:pull/5304

PR: https://git.openjdk.java.net/jdk/pull/5304