Option: Use GS instead of FS for TLS

[svk via cfe-commits]

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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