RFR: 8295264: Fix PaX check on RISC-V

[Ludovic Henry]

On Thu, 13 Oct 2022 07:49:55 GMT, Ludovic Henry <luhenry 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

It should be extremely safe to backport, and it explicits the default behavior to paper over a kernel bug. Let me request backport in JBS.

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PR: https://git.openjdk.org/jdk/pull/10690