x86, tlb flush_data: replace per_cpu with an array

Impact: micro-optimization, memory reduction

On x86_64 flush tlb data is stored in per_cpu variables. This is
unnecessary because only the first NUM_INVALIDATE_TLB_VECTORS entries
are accessed.

This patch aims at making the code less confusing (there's nothing
really "per_cpu") by using a plain array. It also would save some memory
on most distros out there (Ubuntu x86_64 has NR_CPUS=64 by default).

[ Ravikiran G Thirumalai also pointed out that the correct alignment
  is ____cacheline_internodealigned_in_smp, so that there's no
  bouncing on vsmp. ]

Signed-off-by: Frederik Deweerdt <[email protected]>
Acked-by: Ravikiran Thirumalai <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

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