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

[Tim Bell]

On Mon, 22 Apr 2024 13:11:02 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> 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.

Approved

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Marked as reviewed by tbell (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18886#pullrequestreview-2014770529