Remove an unused enumeration value.

Review URL: http://codereview.chromium.org/366030 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Author: kmillikin@chromium.org

src/ast.h

@@ -952,11 +952,7 @@ class Slot: public Expression {
  // variable name in the context object on the heap,
  // with lookup starting at the current context. index()
  // is invalid.
- LOOKUP,
-
- // A property in the global object. var()->name() is
- // the property name.
- GLOBAL
+ LOOKUP
  };
 
  Slot(Variable* var, Type type, int index)

src/prettyprinter.cc

@@ -1339,9 +1339,6 @@ void JsonAstBuilder::VisitSlot(Slot* expr) {
  case Slot::LOOKUP:
  AddAttribute("type", "LOOKUP");
  break;
- case Slot::GLOBAL:
- AddAttribute("type", "GLOBAL");
- break;
  }
  AddAttribute("index", expr->index());
  }

src/scopeinfo.cc

@@ -100,8 +100,7 @@ ScopeInfo<Allocator>::ScopeInfo(Scope* scope)
  break;
 
  case Slot::LOOKUP:
- case Slot::GLOBAL:
- // these are currently not used
+ // This is currently not used.
  UNREACHABLE();
  break;
  }