RFR: JDK-8300265: Remove metaprogramming/isSigned.hpp [v2]

[Kim Barrett]

On Sat, 21 Jan 2023 18:04:41 GMT, Justin King <jcking at openjdk.org> wrote:

>> Code cleanup of pre-C++11 <type_traits> implementations.
>
> Justin King has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - VS Code merged wierdly
>    
>    Signed-off-by: Justin King <jcking at google.com>
>  - Merge remote-tracking branch 'upstream/master' into remove-is-signed
>  - Remove metaprogramming/isSigned.hpp
>    
>    Signed-off-by: Justin King <jcking at google.com>

I think this is waiting for a new `integrate` command after the changes to deal with the merge conflict, to be followed by sponsorship.

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PR: https://git.openjdk.org/jdk/pull/12042