RFR: 8280056: gtest/LargePageGtests.java#use-large-pages failed "os.release_one_mapping_multi_commits_vm" [v3]

[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.

Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:

  attempt to allocate on border of a reserved region

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16240/files
  - new: https://git.openjdk.org/jdk/pull/16240/files/5b5eb8cb..051d71d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16240&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16240&range=01-02

  Stats: 47 lines in 7 files changed: 5 ins; 16 del; 26 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