[RFC PATCHSET] x86, cpu: Clean up and unify the NOP selection infrastructure

[H. Peter Anvin]

This is a RFC patchset to clean up and unify the NOP selection.  In
particular, this patchset gets rid of data structures built using
assembly, moves the selection of an atomic 5-byte NOP into the same
infrastructure as everything else, and does some small amount of 32-
vs. 64-bit unification.

Comments appreciated.

	[PATCH 1/3] x86, percpu: Use ASM_NOP4 instead of hardcoding P6_NOP4
	[PATCH 2/3] x86, cpu: Clean up and unify the NOP selection infrastructure
	[PATCH 3/3] x86, cpu: Change NOP selection for certain Intel CPUs
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