RFR: 8330820: Remove remnants of operator_new.cpp in build system

Mon Apr 22 13:17:36 UTC 2024

In [JDK-8282469](https://bugs.openjdk.org/browse/JDK-8282469), the file operator_new.cpp was removed from Hotspot. Unfortunately, some ugly hacks related to this file remained in the build system. They should be removed.

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Commit messages:
 - 8330820: Remove remnants of operator_new.cpp in build system

Changes: https://git.openjdk.org/jdk/pull/18886/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18886&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330820
  Stats: 10 lines in 2 files changed: 0 ins; 9 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18886.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18886/head:pull/18886

PR: https://git.openjdk.org/jdk/pull/18886