Handle case when return is followed by scalar expression on one-line if (Fortran)

[zbeekman]

Handle the case when return is followed by scalar expression on one-line if.

e.g.,

function foo(a)
  ! some body w/ declartions and statments
  if (a > 10) return 11
  ! more stuff
  if (a < 5) return 4
  ! ...
end fuction foo

[zbeekman]

Upon further investigation this is an obsolescent feature. This is an alternate return form for a subroutine to branch to a label on exit for error handling. We should not be doing anything extra at this time to support if (<condition>) return <scalar-int-expr>