[cleanup] Remove dead code from Variable and simplify PatternRewriter slightly

src/ast/variables.h

Index: src/ast/variables.h
diff --git a/src/ast/variables.h b/src/ast/variables.h
index 5bc7869646de4d0de37514f1b21602776e519b86..47ff313286ef044536299a013a7b75858379aecf 100644
--- a/src/ast/variables.h
+++ b/src/ast/variables.h
@@ -64,7 +64,6 @@ class Variable final : public ZoneObject {
   bool IsContextSlot() const { return location() == VariableLocation::CONTEXT; }
   bool IsLookupSlot() const { return location() == VariableLocation::LOOKUP; }
   bool IsGlobalObjectProperty() const;
-  bool IsStaticGlobalObjectProperty() const;
 
   bool is_dynamic() const { return IsDynamicVariableMode(mode()); }
   bool binding_needs_init() const {