Make loop assignment analysis a separate phase.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 4ecbda764bf6402a628459988e4325cf3d61e0c2..cde5e7182df0cba24ed1147a4b503d62a9b0a9e9 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -20,14 +20,14 @@ namespace internal {
 namespace compiler {
 
 AstGraphBuilder::AstGraphBuilder(Zone* local_zone, CompilationInfo* info,
-                                 JSGraph* jsgraph)
+                                 JSGraph* jsgraph, LoopAssignmentAnalysis* loop)
     : StructuredGraphBuilder(local_zone, jsgraph->graph(), jsgraph->common()),
       info_(info),
       jsgraph_(jsgraph),
       globals_(0, local_zone),
       breakable_(NULL),
       execution_context_(NULL),
-      loop_assignment_analysis_(NULL) {
+      loop_assignment_analysis_(loop) {
   InitializeAstVisitor(local_zone);
 }
 
@@ -62,12 +62,6 @@ bool AstGraphBuilder::CreateGraph() {
   int parameter_count = info()->num_parameters();
   graph()->SetStart(graph()->NewNode(common()->Start(parameter_count)));
 
-  if (FLAG_loop_assignment_analysis) {
-    // TODO(turbofan): use a temporary zone for the loop assignment analysis.
-    AstLoopAssignmentAnalyzer analyzer(zone(), info());
-    loop_assignment_analysis_ = analyzer.Analyze();
-  }
-
   // Initialize the top-level environment.
   Environment env(this, scope, graph()->start());
   set_environment(&env);