RFR: 8283643: [AIX, testbug] MachCodeFramesInErrorFile test fails to find 'Native frames' text [v6]

[Tyler Steele]

> I observed a failure of MachCodeFramesInErrorFile.java on AIX. The raised error complains that 'Native frames: ' is missing. To fix the failure, I made two changes to the test that allowed it to pass on AIX.
> 
> The first change made was to the test's `extractFrames` method. AIX overrides `os::platform_print_native_stack` with stack printing specific to AIX/Power. This code does not produce the 'Native frames: ' text that `vmError::print_native_stack` does, so the test was modified to expect the AIX output when run on AIX. [Edit: The changes made to `extractFrames` are now minimal. I made the change to `AixNativeCallstack::print_callstack_for_context` instead.]
> 
> A second change was made to the address passed to the `crashInNative1` method. AIX does not consider low-address memory to be protected as other platforms do. In fact, "the first 256 bytes are reserved for software use" according to the Power ISA. Accordingly, the read address for PPC was changed to -1 (0xFF..FF) to produce the expected failure result.
> 
> ### Testing
> 
> Tier1 tests complete as expected on AIX/Power.

Tyler Steele has updated the pull request incrementally with one additional commit since the last revision:

  Use OuputAnalyzer::reportDiagnosticSummary instead of printing directly.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8094/files
  - new: https://git.openjdk.java.net/jdk/pull/8094/files/d13f91af..d0a05457

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8094&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8094&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8094.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8094/head:pull/8094

PR: https://git.openjdk.java.net/jdk/pull/8094