[jdk17u-dev] RFR: 8289182: NMT: MemTracker::baseline should return void

[María Arias de Reyna]

This backport does not introduce any new feature or bug fixing, but it removes dead code. Before the backport, MemTracker::baseline() always returned true. Now, it returns void and all the conditionals that depended on that result are simplified.

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Commit messages:
 - Backport b96ba19807845739b36274efb168dd048db819a3

Changes: https://git.openjdk.org/jdk17u-dev/pull/2415/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2415&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289182
  Stats: 47 lines in 8 files changed: 0 ins; 11 del; 36 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2415.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2415/head:pull/2415

PR: https://git.openjdk.org/jdk17u-dev/pull/2415