A ProcedureDesignator is a derived type constructor call if the name
resolves to a derived type. We need to recognize it as such and not
report an error. It may be in another derived type so we have to call
FindSymbol() first to find the derived type.
Most of the diffs are due to `symbol` changing from a reference to a
pointer.
In this example we were reporting an error on the first `t1()` and
resolving the second as an external function call.
```
module m
type :: t1
end type
type(t1) :: x = t1()
type t2
type(t1) :: y = t1()
end type
end module
```
Original-commit: flang-compiler/f18@717b22ca2b
Reviewed-on: https://github.com/flang-compiler/f18/pull/116
d7d69474c8