RFR: 8342639: Global operator new in adlc has wrong exception spec

[Kim Barrett]

Please review this change to remove the definition of
`operator new(size_t, int, const char*, int) throw()`

It doesn't seem to be needed anymore, if it ever really was. See discussion in
JBS for some more details.

Testing: mach5 tier1-5, to cover various different build configurations.

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Commit messages:
 - remove operator new

Changes: https://git.openjdk.org/jdk/pull/25668/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25668&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342639
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25668.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25668/head:pull/25668

PR: https://git.openjdk.org/jdk/pull/25668