Make suspend checks note have side effects.

Also adjust gtests.

Change-Id: I5e1a3e53115812b45ec7f4b6f50ba468fa7ac6b1
diff --git a/compiler/optimizing/ssa_test.cc b/compiler/optimizing/ssa_test.cc
index ad3b205..fffe5c2 100644
--- a/compiler/optimizing/ssa_test.cc
+++ b/compiler/optimizing/ssa_test.cc
@@ -83,10 +83,10 @@
   HGraph* graph = builder.BuildGraph(*item);
   ASSERT_NE(graph, nullptr);
 
+  graph->BuildDominatorTree();
   // Suspend checks implementation may change in the future, and this test relies
   // on how instructions are ordered.
   RemoveSuspendChecks(graph);
-  graph->BuildDominatorTree();
   graph->TransformToSSA();
   ReNumberInstructions(graph);