[Interpreter] Unify global and unallocated variable access.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index c238058767aec2f601cc11e79b1993b4a7ce850c..b546fb21f0526f1211e90ed927182e6632351ba9 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -96,6 +96,7 @@ class InterpreterAssembler {
   Node* LoadObjectField(Node* object, int offset);
 
   // Load |slot_index| from |context|.
+  Node* LoadContextSlot(Node* context, int slot_index);
   Node* LoadContextSlot(Node* context, Node* slot_index);
   // Stores |value| into |slot_index| of |context|.
   Node* StoreContextSlot(Node* context, Node* slot_index, Node* value);