RFR: 8325163: Enable -Wpedantic on clang

[David Holmes]

On Mon, 5 Feb 2024 15:42:40 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> I thought we didn't, because we were instead supposed to use INTPTR_FORMAT and
the (currently?) equivalent PTR_FORMAT. Those macros aren't legacy, they are
to provide consistent output across platforms. "%p" provides implementation
defined output. 

My understanding/recollection was that those issues with `%p` had gone away and so we could start using it.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/17687#issuecomment-1928814503