Fix gtest by adding fake lifetime positions.

Change-Id: I7cd89143103ac3e372406dff5d3837c9d91bb00d
diff --git a/compiler/optimizing/ssa_liveness_analysis.h b/compiler/optimizing/ssa_liveness_analysis.h
index 4cbe29a..4667825 100644
--- a/compiler/optimizing/ssa_liveness_analysis.h
+++ b/compiler/optimizing/ssa_liveness_analysis.h
@@ -1219,6 +1219,7 @@
   size_t number_of_ssa_values_;
 
   ART_FRIEND_TEST(RegisterAllocatorTest, SpillInactive);
+  ART_FRIEND_TEST(RegisterAllocatorTest, FreeUntil);
 
   DISALLOW_COPY_AND_ASSIGN(SsaLivenessAnalysis);
 };