RFR: 8315841: RISC-V: Check for hardware TSO support

[Ludovic Henry]

On Thu, 7 Sep 2023 11:27:25 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> So we would have to build whole java for TSO mode, then UseZtso could be a static compile-time option

We don't have to build hotspot for TSO in order to use it in code generated for Java, given the RVTSO memory model is strictly stronger than RVWMO. 

We could indeed set `UseZtso` statically in case hotspot is compiled with TSO. ~I don't know how to check the ELF-compiled options, would you know how we do it elsewhere?~ (you just updated your comment with how to do it)

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PR Comment: https://git.openjdk.org/jdk/pull/15613#issuecomment-1709998888