[crac] RFR: Fix OSX x86_64 CRaC crash

[Jan Kratochvil]

On Fri, 29 Sep 2023 10:12:50 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> - 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 <<
> ==============================

You are right. I did not notice as during the x86 commit the code was still using `NULL`s: https://github.com/openjdk/crac/commit/5d1f71daf06870810c9ca24e911d6191cc4f3006

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PR Comment: https://git.openjdk.org/crac/pull/121#issuecomment-1740775076