Use HOptimization abstraction for running optimizations.

Move existing optimizations to it.

Change-Id: I3b43f9997faf4ed8875162e3a3abdf99375478dd
diff --git a/compiler/optimizing/dead_code_elimination_test.cc b/compiler/optimizing/dead_code_elimination_test.cc
index 0c68074..5d4b9cb 100644
--- a/compiler/optimizing/dead_code_elimination_test.cc
+++ b/compiler/optimizing/dead_code_elimination_test.cc
@@ -41,8 +41,7 @@
   ASSERT_EQ(actual_before, expected_before);
 
   x86::CodeGeneratorX86 codegen(graph);
-  HGraphVisualizer visualizer(nullptr, graph, codegen, "");
-  HDeadCodeElimination(graph, visualizer).Run();
+  HDeadCodeElimination(graph).Run();
   SSAChecker ssa_checker(&allocator, graph);
   ssa_checker.Run();
   ASSERT_TRUE(ssa_checker.IsValid());