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

[Julian Waters]

On Fri, 15 Dec 2023 09:05:37 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> 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
>
> Looks like this change has also already been made, by JDK-8319440.
> 
> All of the other non-comment uses of "register" I found in HotSpot are gcc local variable register specifications:
> https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Local-Register-Variables.html
> So are a different thing and not affected by the deprecation/removal of the C++ "register" keyword.

Ah, I was not aware that the asm specifications for explicit registers overrides the warning about the register keyword, thanks!

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PR Review Comment: https://git.openjdk.org/jdk/pull/14988#discussion_r1427866744