RFR: 8305480: test/hotspot/jtreg/runtime/NMT/VirtualAllocCommitMerge.java failing on 32 bit arm

[Vladimir Petko]

os::current_frame() is stubbed out on the Linux Arm Thumb platform [1].

This affects 'MemDetailReporter::report_virtual_memory_region()'[2] causing the trace to miss 'from  <location>' part which breaks 'test/hotspot/jtreg/runtime/NMT/VirtualAllocCommitMerge.java'.


result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: '[0x[0]*7947e000 - 0x[0]*794de000] committed 384KB from.*' missing from stdout/stderr

This PR relaxes the test assertion, as 'MemDetailReporter::report_virtual_memory_region()' as 'from' statement is only available if the current frame can be unwinded [2].

[1] https://github.com/openjdk/jdk/blob/0deb648985b018653ccdaf193dc13b3cf21c088a/src/hotspot/os_cpu/linux_arm/os_linux_arm.cpp#L219
[2] https://github.com/openjdk/jdk/blob/aa762102e9328ca76663b56b3be6f6141b044744/src/hotspot/share/services/memReporter.cpp#L397

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Commit messages:
 - Relax test assertion

Changes: https://git.openjdk.org/jdk/pull/13291/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13291&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305480
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13291.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13291/head:pull/13291

PR: https://git.openjdk.org/jdk/pull/13291