RFR: 8315072: Remove unneeded AdaptivePaddedAverage::operator new

[Kim Barrett]

Please review this change to remove unneeded `operator new` definitions in
AdaptivePaddedAverage.  See bug for more details.

Testing:
mach5 tier1

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Commit messages:
 - remove unneded operator new in gcutils

Changes: https://git.openjdk.org/jdk/pull/15439/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15439&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315072
  Stats: 44 lines in 5 files changed: 0 ins; 41 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/15439.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15439/head:pull/15439

PR: https://git.openjdk.org/jdk/pull/15439