Unify the handling of comparinsons against null and undefined.

src/full-codegen.cc

 // 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 1298 matching lines @@
     int* stack_depth,
     int* context_length) {
   // The macros used here must preserve the result register.
   __ Drop(*stack_depth);
   __ PopTryHandler();
   *stack_depth = 0;
   return previous_;
 }
 
 
-bool FullCodeGenerator::TryLiteralCompare(CompareOperation* compare,
-                                          Label* if_true,
-                                          Label* if_false,
-                                          Label* fall_through) {
-  bool is_strict = compare->op() == Token::EQ_STRICT;
-  Expression *expr;
+bool FullCodeGenerator::TryLiteralCompare(CompareOperation* expr) {
+  Expression *sub_expr;
   Handle<String> check;
-  if (compare->IsLiteralCompareTypeof(&expr, &check)) {
-    EmitLiteralCompareTypeof(expr, check, if_true, if_false, fall_through);
+  if (expr->IsLiteralCompareTypeof(&sub_expr, &check)) {
+    EmitLiteralCompareTypeof(sub_expr, check);
     return true;
   }
 
-  if (compare->IsLiteralCompareUndefined(&expr)) {
-    EmitLiteralCompareUndefined(expr, if_true, if_false, fall_through);
+  if (expr->IsLiteralCompareUndefined(&sub_expr)) {
+    EmitLiteralCompareNil(expr, sub_expr, kUndefinedValue);
     return true;
   }
 
-  if (compare->IsLiteralCompareNull(&expr)) {
-    EmitLiteralCompareNull(expr, is_strict, if_true, if_false, fall_through);
+  if (expr->IsLiteralCompareNull(&sub_expr)) {
+    EmitLiteralCompareNil(expr, sub_expr, kNullValue);
     return true;
   }
 
   return false;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal