Do not compile the unreachable body of functions with illegal redeclarations.

src/scopes.cc

 // Copyright 2010 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 365 matching lines @@
   return var;
 }
 
 
 void Scope::AddDeclaration(Declaration* declaration) {
   decls_.Add(declaration);
 }
 
 
 void Scope::SetIllegalRedeclaration(Expression* expression) {
-  // Only set the illegal redeclaration expression the
-  // first time the function is called.
+  // Record only the first illegal redeclaration.
   if (!HasIllegalRedeclaration()) {
     illegal_redecl_ = expression;
   }
   ASSERT(HasIllegalRedeclaration());
 }
 
 
 void Scope::VisitIllegalRedeclaration(AstVisitor* visitor) {
   ASSERT(HasIllegalRedeclaration());
   illegal_redecl_->Accept(visitor);
@@ skipping 657 matching lines @@
   if (num_heap_slots_ == Context::MIN_CONTEXT_SLOTS &&
       !must_have_local_context) {
     num_heap_slots_ = 0;
   }
 
   // Allocation done.
   ASSERT(num_heap_slots_ == 0 || num_heap_slots_ >= Context::MIN_CONTEXT_SLOTS);
 }
 
 } }  // namespace v8::internal