Remove more dead code now that legacy const is gone

src/interpreter/bytecode-generator.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
@@ skipping 741 matching lines @@
       }
       break;
     case VariableLocation::CONTEXT:
       if (hole_init) {
         builder()->LoadTheHole().StoreContextSlot(execution_context()->reg(),
                                                   variable->index());
       }
       break;
     case VariableLocation::LOOKUP: {
       DCHECK(IsDeclaredVariableMode(mode));
+      DCHECK(!hole_init);
 
       register_allocator()->PrepareForConsecutiveAllocations(3);
       Register name = register_allocator()->NextConsecutiveRegister();
       Register init_value = register_allocator()->NextConsecutiveRegister();
       Register attributes = register_allocator()->NextConsecutiveRegister();
 
       builder()->LoadLiteral(variable->name()).StoreAccumulatorInRegister(name);
-      if (hole_init) {
-        builder()->LoadTheHole().StoreAccumulatorInRegister(init_value);
-      } else {
-        // For variables, we must not use an initial value (such as 'undefined')
-        // because we may have a (legal) redeclaration and we must not destroy
-        // the current value.
-        builder()
-            ->LoadLiteral(Smi::FromInt(0))
-            .StoreAccumulatorInRegister(init_value);
-      }
+      builder()
+          ->LoadLiteral(Smi::FromInt(0))
+          .StoreAccumulatorInRegister(init_value);
       builder()
           ->LoadLiteral(Smi::FromInt(variable->DeclarationPropertyAttributes()))
           .StoreAccumulatorInRegister(attributes)
           .CallRuntime(Runtime::kDeclareLookupSlot, name, 3);
       break;
     }
   }
 }
 
 void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) {
@@ skipping 2407 matching lines @@
   return execution_context()->scope()->language_mode();
 }
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return TypeFeedbackVector::GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8