RFR: 8337785: Fix simple -Wzero-as-null-pointer-constant warnings in x86 code

[Julian Waters]

On Mon, 5 Aug 2024 03:52:18 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> > There really are a lot of these, aren't there? :P
> 
> Yeah, there were many thousand when I started, though a lot were from a small number of places in widely included headers. The large number of PRs is because I've been breaking things up into mostly trivial (or at least simple) changes in focused areas, to make any given review easy.
> 
> In the home stretch. There are a couple more like the current batch, and then some small but more complex ones, including one or two where I think there might be an actual bug involved.
> 
> I'm only planning to enable the warning with gcc for now. Enabling for clang would require testing on platforms I don't have (easy, or any) access to. I also won't be testing your windows/gcc work, so enabling the warning will likely break that, even if all the shared and cpu-specific cases are dealt with.

Good to have a rundown on the problem, thanks. I can deal with the breakages in the Windows/gcc Port, no worries :)

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PR Comment: https://git.openjdk.org/jdk/pull/20453#issuecomment-2268186242