RFR: JDK-8290456: remove os::print_statistics()

[Matthias Baesken]

os::print_statistics() is now empty on all platforms so it can be removed.

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Commit messages:
 - JDK-8290456

Changes: https://git.openjdk.org/jdk/pull/9537/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9537&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290456
  Stats: 13 lines in 5 files changed: 0 ins; 13 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9537.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9537/head:pull/9537

PR: https://git.openjdk.org/jdk/pull/9537