[ast] Simplify a condition.

R=gsathya@chromium.org
TBR=adamk@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2688143002
Cr-Commit-Position: refs/heads/master@{#43096}

src/ast/variables.cc

@@ -37,9 +37,8 @@ Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
 bool Variable::IsGlobalObjectProperty() const {
   // Temporaries are never global, they must always be allocated in the
   // activation frame.
-  return (IsDynamicVariableMode(mode()) ||
-          (IsDeclaredVariableMode(mode()) && !IsLexicalVariableMode(mode()))) &&
-         scope_ != NULL && scope_->is_script_scope();
+  return (IsDynamicVariableMode(mode()) || mode() == VAR) &&
+         scope_ != nullptr && scope_->is_script_scope();
 }
 
 }  // namespace internal