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1.0.10.43: Fix NaN comparison on x86-64

Comisd and comiss sets all of ZF, PF, and CF of EFLAGS if its
operand contains NaN. Because PF is never set by normal
comparison, we use it to check NaN. This is same as "=" vops.

NIIMI Satoshi NIIMI Satoshi 2007-10-11

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changed src/compiler
changed src/compiler/x86-64
changed src/compiler/x86-64/float.lisp
changed tests
changed tests/float.pure.lisp
changed version.lisp-expr
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