[PATCH] fix sinf(NAN)

[Szabolcs Nagy]

sinf(NAN) should not signal invalid fp exception
so use isless instead of < where NAN is compared.

this makes the sinf tests pass on aarch64.

2017-12-05  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/ieee754/flt-32/s_sinf.c (sinf): Use isless.
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