Nuke CompareToNull AST node.

src/full-codegen.h

 // Copyright 2011 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 393 matching lines @@
                                 Label* if_false,
                                 Label* fall_through);
 
   // Platform-specific code for strict equality comparison with
   // the undefined value.
   void EmitLiteralCompareUndefined(Expression* expr,
                                    Label* if_true,
                                    Label* if_false,
                                    Label* fall_through);
 
+  // Platform-specific code for equality comparison with the null value.
+  void EmitLiteralCompareNull(Expression* expr,
+                              bool is_strict,
+                              Label* if_true,
+                              Label* if_false,
+                              Label* fall_through);
   // Bailout support.
   void PrepareForBailout(Expression* node, State state);
   void PrepareForBailoutForId(int id, State state);
 
   // Record a call's return site offset, used to rebuild the frame if the
   // called function was inlined at the site.
   void RecordJSReturnSite(Call* call);
 
   // Prepare for bailout before a test (or compare) and branch.  If
   // should_normalize, then the following comparison will not handle the
@@ skipping 409 matching lines @@
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FullCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_