RFR: 8314488: Compile the JDK as C++17 [v2]

[Julian Waters]

On Fri, 15 Dec 2023 08:03:45 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> src/hotspot/os_cpu/linux_riscv/vm_version_linux_riscv.cpp line 77:
>> 
>>> 75: #define read_csr(csr)                                           \
>>> 76: ({                                                              \
>>> 77:         unsigned long __v;                                      \
>> 
>> Can this change be made separately?  I'd like to have the C++17 switch be as clean as possible.
>
> No problem!

There are, strangely, many more register keywords in the JDK codebase than just this one, but none of them throw the same errors, only this one does

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PR Review Comment: https://git.openjdk.org/jdk/pull/14988#discussion_r1427676677