Break typecheck dependency in escape analysis.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 815a6c69f5d7ff66adb2384c66695f76d4bbef19..ea178dc61a345dff0e09a218b14cf86dc4e34572 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5568,6 +5568,7 @@ class HLoadNamedField: public HTemplateInstruction<2> {
   }
 
   bool HasTypeCheck() const { return OperandAt(0) != OperandAt(1); }
+  void clear_typecheck() { SetOperandAt(1, object()); }

[Michael Starzinger, 2013/08/12 09:22:09]

nit: Can we name this "ClearTypeCheck" instead?

   HObjectAccess access() const { return access_; }
   Representation field_representation() const {
       return access_.representation();