[Slub cleanup 0/9] Slub: cleanups V2

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V1->V2:
- Rebase against 3.4-rc6

A series of cleanup patches that resulted from the rework
of the allocation paths to not disable interrupts.

The patches remove the node field from kmem_cache_cpu and generally
cleans up code in the critical paths. The removal of the node field
increases the cache friendliness of the hotpaths and results in a
slight performance increase.

Hackbench performance before and after using 3.3-rc1

			Before		After
100 process 20000	152.3		151.2
100 process 20000	160.6		154.8
100 process 20000	161.2		155.5
10 process 20000	15.9		15.5
10 process 20000	15.7		15.5
10 process 20000	15.8		15.5
1 process 20000		1.8		1.6
1 process 20000		1.6		1.6
1 process 20000		1.7		1.6

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