Add parse location fields to NullTest and BooleanTest structs.

We did not need a location tag on NullTest or BooleanTest before, because
no error messages referred directly to their locations.  That's planned
to change though, so add these fields in a separate housekeeping commit.

Catversion bump because stored rules may change.

src/backend/rewrite/rewriteManip.c

@@ -1023,6 +1023,7 @@ AddInvertedQual(Query *parsetree, Node *qual)
 	invqual = makeNode(BooleanTest);
 	invqual->arg = (Expr *) qual;
 	invqual->booltesttype = IS_NOT_TRUE;
+	invqual->location = -1;
 
 	AddQual(parsetree, (Node *) invqual);
 }