Expect less in the presence of a string init call.

The compiler currently relies on the dex cache being populated
for doing proper type propagation. If it hasn't, we may end up in the
situation where the DexMethodInliner has recognized a String.<init> call
(because DexMethodInliner only looks at signatures, and does not resolve
types), but the graph builder doesn't see a type and assume it needs
to do access checks and clinit checks on it.

Change-Id: Id79313b0610b127909e3e057305b6632b0b172f7