[cleanup] Global variable declarations are never hole initialized

src/compiler/ast-graph-builder.cc

 // Copyright 2014 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/compiler/ast-graph-builder.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 1074 matching lines @@
   }
 }
 
 
 void AstGraphBuilder::VisitVariableDeclaration(VariableDeclaration* decl) {
   Variable* variable = decl->proxy()->var();
   VariableMode mode = decl->mode();
   bool hole_init = mode == CONST || mode == LET;
   switch (variable->location()) {
     case VariableLocation::GLOBAL:
-    case VariableLocation::UNALLOCATED: {
-      Handle<Oddball> value = variable->binding_needs_init()
-                                  ? isolate()->factory()->the_hole_value()
-                                  : isolate()->factory()->undefined_value();
+    case VariableLocation::UNALLOCATED:
+      DCHECK(!variable->binding_needs_init());
       globals()->push_back(variable->name());
-      globals()->push_back(value);
+      globals()->push_back(isolate()->factory()->undefined_value());
       break;
-    }
     case VariableLocation::PARAMETER:
     case VariableLocation::LOCAL:
       if (hole_init) {
         Node* value = jsgraph()->TheHoleConstant();
         environment()->Bind(variable, value);
       }
       break;
     case VariableLocation::CONTEXT:
       if (hole_init) {
         Node* value = jsgraph()->TheHoleConstant();
@@ skipping 3230 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8