Update math/libm test to only instantiate functions available on specific platforms.
Update math/libm test to only instantiate functions available on specific platforms.

iamrekcah/clay,aep/clay,mario-campos/clay,jckarter/clay,mario-campos/clay,iamrekcah/clay,jckarter/clay,mario-campos/clay,aep/clay,aep/clay,iamrekcah/clay,iamrekcah/clay,mario-campos/clay,jckarter/clay,jckarter/clay,aep/clay,jckarter/clay,aep/clay,mario-campos/clay,iamrekcah/clay,jckarter/clay,aep/clay