RFR(T): 8251846: Replace __linux which is no longer defined

[David Holmes]

Looks fine and trivial.

Thanks,
David

On 15/08/2020 1:56 am, Doerr, Martin wrote:
> Hi,
> 
> we are observing lots of "error occurred during error reporting" problems on linux on PPC64 in JDK16.
> 
> Reason:
> debug.cpp uses "#if defined(__linux)". It is no longer defined in our latest build environment.
> Hence, fixup code for copy of uncontext is missing.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8251846
> 
> Please review this trivial fix:
> http://cr.openjdk.java.net/~mdoerr/8251846_linux_ppc_context_copy_fix/webrev.00/
> 
> Best regards,
> Martin
>