Avoid bool to Oddball conversions by being lazy.

src/ast.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1165 matching lines @@
       return !String::cast(*handle_)->AsArrayIndex(&ignored);
     }
     return false;
   }
 
   Handle<String> AsPropertyName() {
     ASSERT(IsPropertyName());
     return Handle<String>::cast(handle_);
   }
 
-  virtual bool ToBooleanIsTrue() { return handle_->ToBoolean()->IsTrue(); }
-  virtual bool ToBooleanIsFalse() { return handle_->ToBoolean()->IsFalse(); }
+  virtual bool ToBooleanIsTrue() { return handle_->BooleanValue(); }
+  virtual bool ToBooleanIsFalse() { return !handle_->BooleanValue(); }
 
   // Identity testers.
   bool IsNull() const {
     ASSERT(!handle_.is_null());
     return handle_->IsNull();
   }
   bool IsTrue() const {
     ASSERT(!handle_.is_null());
     return handle_->IsTrue();
   }
@@ skipping 1737 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Visitor visitor_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_