This PR is to address `TODO(loc, "procedure pointer component default
initialization");`.
It handles default init for procedure pointer components in a derived
type that is 32 bytes or larger (Default init for smaller size type has
already been handled).
```
interface
subroutine sub()
end
end interface
type dt
real :: r1 = 5.0
procedure(real), pointer, nopass :: pp1 => null()
real, pointer :: rp1 => null()
procedure(), pointer, nopass :: pp2 => sub
end type
type(dt) :: dd1
end
```
