x86: Add new static_cpu_has() function using alternatives

For CPU-feature-specific code that touches performance-critical paths,
introduce a static patching version of [boot_]cpu_has().  This is run
at alternatives time and is therefore not appropriate for most
initialization code, but on the other hand initialization code is
generally not performance critical.

On gcc 4.5+ this uses the new "asm goto" feature.

Signed-off-by: H. Peter Anvin <[email protected]>
Cc: Avi Kivity <[email protected]>
Cc: Suresh Siddha <[email protected]>
LKML-Reference: <[email protected]>

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