RFR: 8314488: Compile the JDK as C++17 [v5]

[Magnus Ihse Bursie]

On Wed, 10 Jan 2024 13:11:38 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Compile the JDK as C++17, enabling the use of all C++17 language features
>
> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove unnecessary -std=c++17 option in Lib.gmk

Also please note that if the minimum version of the compilers are bumped in the configure script, the documentation in doc/building.md needs to be updated to match this as well. (And building.html file needs to be regenerated.)

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1887049046