RFR: JDK-8272771: frame::pd_ps() is not implemented on any platform

[Tobias Holenstein]

removed frame::pd_ps() which is not implemented on any platform. Replaced the only usage of frame::pd_ps() in the debug function `ps()` with `frame::print_on`. Tested on Tier1.

Thanks!

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Commit messages:
 - JDK-8272771: frame::pd_ps() is not implemented on any platform

Changes: https://git.openjdk.java.net/jdk/pull/5487/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5487&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272771
  Stats: 10 lines in 8 files changed: 0 ins; 9 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5487.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5487/head:pull/5487

PR: https://git.openjdk.java.net/jdk/pull/5487