Pull up following revision(s) (requested by ad in ticket #74):
sys/arch/i386/isa/npx.c: revision 1.131
sys/arch/amd64/amd64/fpu.c: revision 1.28
sys/arch/i386/i386/genassym.cf: revision 1.77
sys/arch/i386/i386/autoconf.c: revision 1.93
sys/arch/amd64/amd64/locore.S: revision 1.48
sys/arch/amd64/amd64/machdep.c: revision 1.104
sys/arch/i386/i386/machdep.c: revision 1.646
sys/arch/amd64/amd64/genassym.cf: revision 1.38
sys/arch/i386/i386/locore.S: revision 1.79
PR port-amd64/38293 panic: fp_save ipi didn't
Fix race conditions in FPU IPI handling.

(snj)