[jdk19u] RFR: 8295264: Fix PaX check on RISC-V

[Ludovic Henry]

On Thu, 24 Nov 2022 06:45:50 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

>> On Linux RISC-V, PROT_WRITE doesn't imply PROT_READ [1]
>> 
>> The fix is to pass PROT_READ|PROT_WRITE. That matches all other calls to mmap in hotspot.
>> 
>> [1] https://lkml.org/lkml/2022/9/8/1066
>
> Yes

@VladimirKempik I would need your sponsor to merge this PR.

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PR: https://git.openjdk.org/jdk19u/pull/91