x86-64: Use testl to check __x86_string_control
Use testl, instead of andl, to check __x86_string_control to avoid
updating __x86_string_control.
Reviewed-by: 
Carlos O'Donell <carlos@redhat.com>
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Use testl, instead of andl, to check __x86_string_control to avoid
updating __x86_string_control.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>