x86/vdso: Mark the TSC clocksource path likely
Jumping out of line for the TSC clcoksource read is creating awful code. TSC is likely to be the clocksource at least on bare metal and the PV interfaces are sufficiently more work that the jump over the TSC read is just in the noise. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NVincenzo Frascino <vincenzo.frascino@arm.com> Link: https://lkml.kernel.org/r/20200207124402.328922847@linutronix.de
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