Inliner: make sure the returned value is in the outer graph.

The returned value may be a constant or a parameter value. If so, it
will be in the inlined entry_block and (before this CL) we would not
update its block or graph. This CL fixes this and makes sure that the
returned value belongs to the outer graph.

Change-Id: Ie296f0d5a320c33f39eb187df6d328371ccf6500
2 files changed