RFR: 8290903: Enable function warning attribute for Clang build once Clang supports merging

[David Holmes]

On Sat, 18 Feb 2023 15:26:04 GMT, Afshin Zafari <duke at openjdk.org> wrote:

> The warning attribute is enabled..
> 
> ### Test
> mach5 tier1-5.

I'm a bit confused about the status here. Looking at:

https://github.com/llvm/llvm-project/issues/56519

the issue is still open, not fixed. And the issue is reported as existing in version 14 so the uncommented version check seems wrong anyway. ??

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PR: https://git.openjdk.org/jdk/pull/12634