Some inline debloating, 4.11 edition

[Andi Kleen]

I was looking for bloated inlines, and fixed some of the worst
ones in current master. Often inlines grow over time, and at some point it 
doesn't make sense anymore to have them inline. But the inline
attribute is often kept. 

The attached patches together save around 70k in my kernel.

Andrew, some of the patches are for areas which have no clear
maintainer.