RFR: 8256843: [PPC64] runtime/logging/RedefineClasses.java fails with assert: registers not saved on stack [v2]

[Martin Doerr]

> Method handle logging is broken in fastdebug builds. Problem is that os::current_frame() doesn't return the right frame in fastdebug builds.
> Unfortunately, fixing os::current_frame() would break NMT stack traces (runtime/NMT/CheckForProperDetailStackTrace.java).

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Use Richard's proposal to fix NMT/CheckForProperDetailStackTrace

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1724/files
  - new: https://git.openjdk.java.net/jdk/pull/1724/files/125faee6..aef98cb2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1724&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1724&range=00-01

  Stats: 12 lines in 4 files changed: 8 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1724.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1724/head:pull/1724

PR: https://git.openjdk.java.net/jdk/pull/1724