Stabilize escape analysis (without deopt)

src/compiler/escape-analysis.h

Index: src/compiler/escape-analysis.h
diff --git a/src/compiler/escape-analysis.h b/src/compiler/escape-analysis.h
index 9a91d1a07a6b3a017462e5586e5a9d97247421da..c798bd9f9ea2015ea9ef92f3e11b7bd90894f744 100644
--- a/src/compiler/escape-analysis.h
+++ b/src/compiler/escape-analysis.h
@@ -35,6 +35,7 @@ class EscapeStatusAnalysis {
 
   bool IsVirtual(Node* node);
   bool IsEscaped(Node* node);
+  bool IsAllocation(Node* node);
 
   void DebugPrint();
 
@@ -73,6 +74,30 @@ class EscapeStatusAnalysis {
 DEFINE_OPERATORS_FOR_FLAGS(EscapeStatusAnalysis::EscapeStatusFlags)
 
 
+class MergeCache {
+ public:
+  explicit MergeCache(Zone* zone)
+      : states_(zone), objects_(zone), fields_(zone) {
+    states_.reserve(4);
+    objects_.reserve(4);
+    fields_.reserve(4);
+  }
+  ZoneVector<VirtualState*>& states() { return states_; }
+  ZoneVector<VirtualObject*>& objects() { return objects_; }
+  ZoneVector<Node*>& fields() { return fields_; }
+  void Clear() {
+    states_.clear();
+    objects_.clear();
+    fields_.clear();
+  }
+
+ private:
+  ZoneVector<VirtualState*> states_;
+  ZoneVector<VirtualObject*> objects_;
+  ZoneVector<Node*> fields_;
+};
+
+
 // EscapeObjectAnalysis simulates stores to determine values of loads if
 // an object is virtual and eliminated.
 class EscapeAnalysis {
@@ -85,6 +110,7 @@ class EscapeAnalysis {
   Node* GetReplacement(Node* at, NodeId id);
   bool IsVirtual(Node* node);
   bool IsEscaped(Node* node);
+  bool IsAllocation(Node* node);
 
  private:
   void RunObjectAnalysis();
@@ -110,6 +136,8 @@ class EscapeAnalysis {
 
   VirtualObject* GetVirtualObject(Node* at, NodeId id);
 
+  bool SetEscaped(Node* node);
+
   void DebugPrint();
   void DebugPrintState(VirtualState* state);
   void DebugPrintObject(VirtualObject* state, NodeId id);
@@ -123,6 +151,7 @@ class EscapeAnalysis {
   Zone* const zone_;
   ZoneVector<VirtualState*> virtual_states_;
   EscapeStatusAnalysis escape_status_;
+  MergeCache cache_;
 
   DISALLOW_COPY_AND_ASSIGN(EscapeAnalysis);
 };