Remove unused VariableLocation::GLOBAL.

src/globals.h

 // Copyright 2012 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 925 matching lines @@
 
   // A slot in the local section on the stack.  index() is the variable
   // index in the stack frame, starting at 0.
   LOCAL,
 
   // An indexed slot in a heap context.  index() is the variable index in
   // the context object on the heap, starting at 0.  scope() is the
   // corresponding scope.
   CONTEXT,
 
-  // An indexed slot in a script context that contains a respective global
-  // property cell.  name() is the variable name, index() is the variable
-  // index in the context object on the heap, starting at 0.  scope() is the
-  // corresponding script scope.
-  GLOBAL,
-
   // A named slot in a heap context.  name() is the variable name in the
   // context object on the heap, with lookup starting at the current
   // context.  index() is invalid.
   LOOKUP,
 
   // A named slot in a module's export table.
   MODULE,
 
   kLastVariableLocation = MODULE
 };
@@ skipping 195 matching lines @@
  public:
   enum { kNone = 0x00, kSignedSmall = 0x01, kNumber = 0x3, kAny = 0x7 };
 };
 
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_