Fix deferred library code disabling for inlined functions.

runtime/vm/flow_graph_inliner.cc

Index: runtime/vm/flow_graph_inliner.cc
===================================================================
--- runtime/vm/flow_graph_inliner.cc	(revision 37101)
+++ runtime/vm/flow_graph_inliner.cc	(working copy)
@@ -802,6 +802,10 @@
         FlowGraph::AddToGuardedFields(caller_graph_->guarded_fields(),
                                       (*callee_graph->guarded_fields())[i]);
       }
+      // When inlined, we add the deferred prefixes of the callee to the
+      // caller's list of deferred prefixes.
+      FlowGraph::AddToDeferredPrefixes(caller_graph()->deferred_prefixes(),
+                                       callee_graph->deferred_prefixes());
 
       // We allocate a ZoneHandle for the unoptimized code so that it cannot be
       // disconnected from its function during the rest of compilation.