RFR: 8320886: Unsafe_SetMemory0 is not guarded [v3]

[Frederic Parain]

On Fri, 8 Dec 2023 19:43:28 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> See JBS issue.
>> 
>> Guard the memory access done in Unsafe_SetMemory0 to prevent a SIGBUS error from crashing the VM when a truncated memory mapped file is accessed.
>> 
>> Testing: local `InternalErrorTest`, Tier 1-5
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   adjust whitespace

Marked as reviewed by fparain (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16848#pullrequestreview-1775948001