Option: Use GS instead of FS for TLS

[svk via cfe-commits]

I missed the second part.


Am 05.07.2017 um 23:38 schrieb svk:
> Hello,
>
> the attached patch introduces a -mtls-gs command line option for clang 
> for the x86_64 target.
> This option will force the usage of the GS instead of the FS register 
> for TLS references and
> stack canary references.
> This is particularly useful for low-level kernel-side development.
>
> Best regards,
> Sven Konietzny

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