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

[Julian Waters]

On Fri, 15 Dec 2023 12:56:07 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> It's not that it overrides the warning.  They are different syntactic constructs that just happen to have
>> a word in common.  The joys of parsing C++ ...
>
> The keyword also happens to go in the same location as well. How coincidental...

I also realized that this uses a gcc statement expression currently, I wonder if this could use a lambda expression instead in another change?

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PR Review Comment: https://git.openjdk.org/jdk/pull/14988#discussion_r1427955879