Add more sNaN tests to libm-test.inc.

Add more sNaN tests to libm-test.inc.

This patch adds more tests of signaling NaN inputs to libm-test.inc.
These tests are for a subset of functions with a single floating-point
input where no failures appeared in x86_64 or x86 testing.  I intend
to investigate any failures of these new tests on some other
architectures before dealing with other functions.

Tested for x86_64 and x86.

	* math/libm-test.inc (acosh_test_data): Add sNaN tests.
	(atan_test_data): Likewise.
	(ceil_test_data): Likewise.
	(cos_test_data): Likewise.
	(cosh_test_data): Likewise.
	(erf_test_data): Likewise.
	(exp2_test_data): Likewise.
	(fabs_test_data): Likewise.
	(floor_test_data): Likewise.
	(ilogb_test_data): Likewise.
	(j0_test_data): Likewise.
	(j1_test_data): Likewise.
	(jn_test_data): Likewise.
	(lgamma_test_data): Likewise.
	(lrint_test_data): Likewise.
	(llrint_test_data): Likewise.
	(logb_test_data): Likewise.
	(lround_test_data): Likewise.
	(llround_test_data): Likewise.
	(nearbyint_test_data): Likewise.
	(rint_test_data): Likewise.
	(round_test_data): Likewise.
	(sin_test_data): Likewise.
	(sincos_test_data): Likewise.
	(sinh_test_data): Likewise.
	(sqrt_test_data): Likewise.
	(tan_test_data): Likewise.
	(tanh_test_data): Likewise.
	(tgamma_test_data): Likewise.
	(trunc_test_data): Likewise.
	(y0_test_data): Likewise.
	(y1_test_data): Likewise.
	(yn_test_data): Likewise.