Optimizing: Move GraphChecker memory allocations to arena.

Bug: 18120045
Change-Id: I3934158e6ea4868d9baa1dfcc53b603ca6c521e2
diff --git a/compiler/optimizing/constant_folding_test.cc b/compiler/optimizing/constant_folding_test.cc
index 694f768..b2e222f 100644
--- a/compiler/optimizing/constant_folding_test.cc
+++ b/compiler/optimizing/constant_folding_test.cc
@@ -51,7 +51,7 @@
       X86InstructionSetFeatures::FromCppDefines());
   x86::CodeGeneratorX86 codegenX86(graph, *features_x86.get(), CompilerOptions());
   HConstantFolding(graph).Run();
-  SSAChecker ssa_checker_cf(&allocator, graph);
+  SSAChecker ssa_checker_cf(graph);
   ssa_checker_cf.Run();
   ASSERT_TRUE(ssa_checker_cf.IsValid());
 
@@ -63,7 +63,7 @@
   check_after_cf(graph);
 
   HDeadCodeElimination(graph).Run();
-  SSAChecker ssa_checker_dce(&allocator, graph);
+  SSAChecker ssa_checker_dce(graph);
   ssa_checker_dce.Run();
   ASSERT_TRUE(ssa_checker_dce.IsValid());