AWLF fails to propagate extrema for mixed N_array node

Bugzilla Link	766
Created on	Nov 01, 2010 22:56
Version	svn
OS	Linux
Architecture	PC

Extended Description

If an N_array node, iv,  used in a sel(iv, producerWL) contains
a mix of constants and WITHIDS, e.g, iv = [ 2, j, k], then
iv does not obtain extrema, which defeats AWLF on the producerWL.
Here is failing code, to be compiled with: 
  sac2c -ecc -extrema -doawlf -nowlf mixedIV.sac
use Array: {-,transpose,genarray,++,*,iota,sum};
int main()
{
 shp = [ 6, 10];
 AAA = with {
          ( . <= iv=[i,j] <= .) :  
            _add_SxS_( j, _mul_SxS_( i, _sel_VxA_( [1], shp)));
          } : genarray( shp, 42);
 b = with {
          ( . <= IV=[JJ] <= .) :
            _sel_VxA_( [ 1, JJ], AAA);
          } : genarray( [8], 666);
 z = sum(b) - 108;
 return(z);
}