[jdk11u-dev] RFR: 8272345: macos doesn't check `os::set_boot_path()` result

[Alex Kasko]

Backport of the Mac-specific fix.

Test change does not apply cleanly, it was resolved manually because this test was moved into different directory with [JDK-8202339](https://bugs.openjdk.java.net/browse/JDK-8202339).

Additional testing:

 - [x] checked that test passes on Mac and Linux, was unable to reproduce the crash problem on Mac without the patch

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Commit messages:
 - Backport bd27bb9cbedebd09f589679947ff32261f9ef352

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/674/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=674&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272345
  Stats: 13 lines in 2 files changed: 5 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/674.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/674/head:pull/674

PR: https://git.openjdk.java.net/jdk11u-dev/pull/674