lgamma_spec() coverage

specification Unifloat *lgamma_spec( CallContext context, Unifloat *x, IntT *signgam, ErrorCode *errno )

coverages	branches	failures	hits/fails
C	X IS NORMAL POSITIVE EXCEPT ONE OR TWO		6
	X IS NORMAL NON POSITIVE	failure 17: Requirement failed: {lgammaf.08} If x is a non-positive integer function shall return +HUGE_VAL failure 19: Requirement failed: {lgamma.08} If x is a non-positive integer function shall return +HUGE_VAL failure 21: Requirement failed: {lgammal.08} If x is a non-positive integer function shall return +HUGE_VAL	6/3
	X IS NAN		3
	X IS POSITIVE INFINITY		3
	X IS NEGATIVE INFINITY		3
	X IS ONE		3
	X IS TWO		3
	100% (7/7)		27/3