Make loop assignment analysis a separate phase.

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index a2cd26f1b2e12f790c1ee40b176948d36692c66b..c52d78955fafb62cf79ce0b1c0b974a9fd86ed3d 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -26,7 +26,8 @@ class LoopBuilder;
 // of function inlining.
 class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
  public:
-  AstGraphBuilder(Zone* local_zone, CompilationInfo* info, JSGraph* jsgraph);
+  AstGraphBuilder(Zone* local_zone, CompilationInfo* info, JSGraph* jsgraph,
+                  LoopAssignmentAnalysis* loop_assignment = NULL);
 
   // Creates a graph by visiting the entire AST.
   bool CreateGraph();