RFR: 8280056: gtest/LargePageGtests.java#use-large-pages failed "os.release_one_mapping_multi_commits_vm"

[Afshin Zafari]

The `attempt_allocate_memory_at(addr, size)` may fail for some reasons that `::mmap`  will report. To find out why an attempt failed, an `int *` is passed down deep to the `::mmap` to return the `ERRNO` back to the callers.
This error code is used in gTest test case to show a proper message.

The changed test case never failed after 10K+ repetitions, but in case it happens in future the reason is also printed out.

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Commit messages:
 - 8280056: gtest/LargePageGtests.java#use-large-pages failed "os.release_one_mapping_multi_commits_vm"

Changes: https://git.openjdk.org/jdk/pull/16240/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16240&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280056
  Stats: 38 lines in 7 files changed: 16 ins; 0 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/16240.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16240/head:pull/16240

PR: https://git.openjdk.org/jdk/pull/16240