Stop overallocating feedback vector slots.

src/ast.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 1666 matching lines @@
     return var()->IsUnallocated() || var()->IsLookupSlot();
   }
 
   virtual FeedbackVectorRequirements ComputeFeedbackRequirements(
       Isolate* isolate, const ICSlotCache* cache) override;
 
   void SetFirstFeedbackICSlot(FeedbackVectorICSlot slot,
                               ICSlotCache* cache) override;
   Code::Kind FeedbackICSlotKind(int index) override { return Code::LOAD_IC; }
   FeedbackVectorICSlot VariableFeedbackSlot() {
-    DCHECK(!UsesVariableFeedbackSlot() || !variable_feedback_slot_.IsInvalid());
     return variable_feedback_slot_;
   }
 
   static int num_ids() { return parent_num_ids() + 1; }
   BailoutId BeforeId() const { return BailoutId(local_id(0)); }
 
  protected:
   VariableProxy(Zone* zone, Variable* var, int start_position,
                 int end_position);
 
@@ skipping 87 matching lines @@
   }
   void SetFirstFeedbackICSlot(FeedbackVectorICSlot slot,
                               ICSlotCache* cache) override {
     property_feedback_slot_ = slot;
   }
   Code::Kind FeedbackICSlotKind(int index) override {
     return key()->IsPropertyName() ? Code::LOAD_IC : Code::KEYED_LOAD_IC;
   }
 
   FeedbackVectorICSlot PropertyFeedbackSlot() const {
-    DCHECK(!property_feedback_slot_.IsInvalid());
     return property_feedback_slot_;
   }
 
   static LhsKind GetAssignType(Property* property) {
     if (property == NULL) return VARIABLE;
     bool super_access = property->IsSuperAccess();
     return (property->key()->IsPropertyName())
                ? (super_access ? NAMED_SUPER_PROPERTY : NAMED_PROPERTY)
                : (super_access ? KEYED_SUPER_PROPERTY : KEYED_PROPERTY);
   }
@@ skipping 1821 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_