ART: Fix InsertCaseLabel to return boundary_lir always

This patch doesn't return new_label when cu_->verbose, because
we will not assign offsets to new_label at this stage.

Change-Id: Ie7f625848b0cf7cabfbba694b5c20b0784bc8501
Signed-off-by: Chao-ying Fu <chao-ying.fu@intel.com>
diff --git a/compiler/dex/quick/codegen_util.cc b/compiler/dex/quick/codegen_util.cc
index 88a4605..055c39f 100644
--- a/compiler/dex/quick/codegen_util.cc
+++ b/compiler/dex/quick/codegen_util.cc
@@ -865,7 +865,6 @@
     DCHECK(!new_label->flags.use_def_invalid);
     new_label->u.m.def_mask = &kEncodeAll;
     InsertLIRAfter(boundary_lir, new_label);
-    res = new_label;
   }
   return res;
 }