[crac] RFR: Fix OSX x86_64 CRaC crash

[Jan Kratochvil]

- copy-paste the same code from src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp

It has fixed 3 testcases but the last 4th failure looks to be unrelated to this problem.

==============================
Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR
   jtreg:test/jdk/jdk/crac/JarFileFactoryCacheTest/JarFileFactoryCacheTest.java
                                                         1     1     0     0
   jtreg:test/jdk/jdk/crac/MXBean.java                   1     1     0     0
   jtreg:test/jdk/jdk/crac/RefQueueTest.java             1     1     0     0
   jtreg:test/jdk/jdk/crac/recursiveCheckpoint/Test.java
>>                                                       1     0     1     0 <<
==============================

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Commit messages:
 - Fix OSX x86_64 CRaC crash

Changes: https://git.openjdk.org/crac/pull/121/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=121&range=00
  Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/121.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/121/head:pull/121

PR: https://git.openjdk.org/crac/pull/121