Inlining support in optimizing.

Currently only inlines simple things that don't require an
environment, such as:
- Returning a constant.
- Returning a parameter.
- Returning an arithmetic operation.

Change-Id: Ie844950cb44f69e104774a3cf7a8dea66bc85661
diff --git a/compiler/optimizing/constant_folding_test.cc b/compiler/optimizing/constant_folding_test.cc
index a56b9d9..cad6683 100644
--- a/compiler/optimizing/constant_folding_test.cc
+++ b/compiler/optimizing/constant_folding_test.cc
@@ -38,8 +38,7 @@
   HGraph* graph = CreateCFG(&allocator, data, return_type);
   ASSERT_NE(graph, nullptr);
 
-  graph->BuildDominatorTree();
-  graph->TransformToSSA();
+  graph->TryBuildingSsa();
 
   StringPrettyPrinter printer_before(graph);
   printer_before.VisitInsertionOrder();