* include/bits/valarray_meta.h (_UnFunBase): Take a second
template parameter. Remove _M_func data member.
(_UnFunClos): Take a third template parameter.
(__abs, __cos, __acos, __cosh, __sin, __asin, __sinh, __tan,
__atan, __tanh, __exp, __log, __log10, __sqrt): New classes.
(_DEFINE_EXPR_UNARY_OPERATOR): Adjust definition.
From-SVN: r55365
