Use the previous approach for finding generator's match rank, now

that we have a use case. Add an explanation in code. More details
will be posted to the list.


[SVN r18475]

tools/build

@@ -1 +1 @@
-Subproject commit 52267f78844f11484034bdd0bfb0eeec01fce0f4
+Subproject commit 5c685928a7c5eef9ef680a05530ea3989330c00c