I'm not sure this is right — if the library we're looking for exists in `$PRODUCT_OUT/symbols`, we should use that instead of the stripped version outside of that directory.  It looks like we're just shelling out to `find`, which might return either one depending on what the underlying FS feels like doing.  Also, that would waste time walking through all the intermediate `.o` files in `$PRODUCT_OUT/obj`.

So I think what we want to do is search `$PRODUCT_OUT/symbols` and `$PRODUCT_OUT/system` in that order.  (There are also `root` and `recovery`, which have some executables but no libraries, so I don't think they'd be relevant to a Gecko profile.)