machine/ieeefp.h isfinite speedup

[Howland Craig D (Craig)]

The attached patch makes the same speedup edits to the isfinite macro
in machine/ieeefp.h as had been done some time ago in math.h, calling
fpclassify only once instead of possibly twice.  It also avoids the
un-necessary use of __typeof__ (as did the earlier math.h edit).
Craig
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