RFR: 8233724: Remove -Wc++14-compat warning suppression in operator_new.cpp

[Harold Seigel]

Please review this small change to remove the unneeded 'PRAGMA_DISABLE_GCC_WARNING("-Wc++14-compat")' from operator_new.cpp.  The change was tested by running Mach5 tiers 1-2 on Linux, Mac OS, and Windows.

Thanks, Harold

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Commit messages:
 - 8233724: Remove -Wc++14-compat warning suppression in operator_new.cpp

Changes: https://git.openjdk.java.net/jdk/pull/6005/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6005&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233724
  Stats: 11 lines in 1 file changed: 0 ins; 10 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6005.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6005/head:pull/6005

PR: https://git.openjdk.java.net/jdk/pull/6005