RFR: JDK-8299482: Remove metaprogramming/isIntegral.hpp [v3]

[Justin King]

On Tue, 3 Jan 2023 14:36:38 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:
> 
>  - Merge remote-tracking branch 'upstream/master' into remove-is-integral
>  - Add missing include
>    
>    Signed-off-by: Justin King <jcking at google.com>
>  - Remove metaprogramming/isIntegral.hpp
>    
>    Signed-off-by: Justin King <jcking at google.com>

Forgot to remove the actual header apparently, updated.

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PR: https://git.openjdk.org/jdk/pull/11818