Revert "Fix gtests after loop inlining support."

This reverts commit 0e342cd5ccf0f648e165fa4fd270b44dfbea8be6.

Loop inlining exposes BCE issues.

Bug: 26689526
Change-Id: Iab0f8f502d8b389af4efc2e99e28cae59c00ee9b
diff --git a/compiler/optimizing/graph_test.cc b/compiler/optimizing/graph_test.cc
index d530564..d4b9b71 100644
--- a/compiler/optimizing/graph_test.cc
+++ b/compiler/optimizing/graph_test.cc
@@ -164,7 +164,7 @@
 
   // Ensure there is only one back edge.
   ASSERT_EQ(if_block->GetPredecessors().size(), 2u);
-  ASSERT_EQ(if_block->GetPredecessors()[0], entry_block->GetSingleSuccessor());
+  ASSERT_EQ(if_block->GetPredecessors()[0], entry_block);
   ASSERT_NE(if_block->GetPredecessors()[1], if_block);
 
   // Ensure the new block is the back edge.
@@ -199,7 +199,7 @@
 
   // Ensure there is only one back edge.
   ASSERT_EQ(if_block->GetPredecessors().size(), 2u);
-  ASSERT_EQ(if_block->GetPredecessors()[0], entry_block->GetSingleSuccessor());
+  ASSERT_EQ(if_block->GetPredecessors()[0], entry_block);
   ASSERT_NE(if_block->GetPredecessors()[1], if_block);
 
   // Ensure the new block is the back edge.