[Flang] Allow Intrinsic simpification with min/maxloc dim and scalar result (#76194)

This makes an adjustment to the existing fir minloc/maxloc generation
code to handle functions with a dim=1 that produce a scalar result. This
should allow us to get the same benefits as the existing generated
minmax reductions.

This is a recommit of #75820 with the typename added to the generated
function.