Fix the obnoxious issue with globals propagation in full expressions.

Fixed by backtracking in the parser, and keeping a copy of the original expression if it's a simple_expr, which is used for output in place of the folded one.

There's still the potential issue that if a global is optimized away, then it will "come back" during output and cause an error because the definition is missing.

lslopt/lsloutput.py

@@ -265,7 +265,10 @@ class outscript(object):
         if nt == 'DECL':
             ret = self.dent() + node['t'] + ' ' + node['name']
             if child:
-                ret += ' = ' + self.OutExpr(child[0])
+                if 'orig' in child[0]:
+                    ret += ' = ' + self.OutExpr(child[0]['orig'])
+                else:
+                    ret += ' = ' + self.OutExpr(child[0])
             return ret + ';\n'
         if nt == ';':
             return self.dent() + ';\n'