KVM: optimize memslots searching

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- rebase it on current kvm tree and some cleanups

#	Subject and files	Size	Replies
1/6	KVM: introduce KVM_MEM_SLOTS_NUM macro`arch/x86/include/asm/kvm_host.h` `arch/x86/kvm/mmu.c` `include/linux/kvm_host.h` +1 more	+10 -5	0 replies
2/6	KVM: introduce update_memslots function`arch/x86/kvm/x86.c` `include/linux/kvm_host.h` `virt/kvm/kvm_main.c`	+17 -8	0 replies
3/6	KVM: introduce kvm_for_each_memslot macro`arch/ia64/kvm/kvm-ia64.c` `arch/x86/kvm/mmu.c` `include/linux/kvm_host.h` +2 more	+27 ~~-26~~	0 replies
4/6	KVM: introduce id_to_memslot function`arch/ia64/kvm/kvm-ia64.c` `arch/powerpc/kvm/book3s.c` `arch/x86/kvm/vmx.c` +3 more	+26 ~~-12~~	3 replies
5/6	KVM: sort memslots by its size and use line search`include/linux/kvm_host.h` `virt/kvm/kvm_main.c`	+72 ~~-25~~	0 replies
6/6	KVM: introduce a table to map slot id to index in memslots array`include/linux/kvm_host.h` `virt/kvm/kvm_main.c`	+13 -7	0 replies

No Reviewed-by, Acked-by or Tested-by trailers for v3 yet.

Cover letter [PATCH v3 0/6] KVM: optimize memslots searching

Changelog:
- rebase it on current kvm tree and some cleanups

This patchset is tested on x86 and build tested on powerpc and ia64