Remove CONST_LEGACY VariableMode

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index ba7f0cc9e3e8fb2d6ef067ca0333bf0bb7ebcf90..8957570858a78b872e892a0fa393cd1de0b1834d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4372,7 +4372,7 @@ class ScopeInfo : public FixedArray {
   // slot index if the function name is present and context-allocated (named
   // function expressions, only), otherwise returns a value < 0. The name
   // must be an internalized string.
-  int FunctionContextSlotIndex(String* name, VariableMode* mode);
+  int FunctionContextSlotIndex(String* name);
 
   // Lookup support for serialized scope info.  Returns the receiver context
   // slot index if scope has a "this" binding, and the binding is
@@ -4484,10 +4484,8 @@ class ScopeInfo : public FixedArray {
       : public BitField<bool, ReceiverVariableField::kNext, 1> {};
   class FunctionVariableField
       : public BitField<VariableAllocationInfo, HasNewTargetField::kNext, 2> {};
-  class FunctionVariableMode
-      : public BitField<VariableMode, FunctionVariableField::kNext, 3> {};
-  class AsmModuleField : public BitField<bool, FunctionVariableMode::kNext, 1> {
-  };
+  class AsmModuleField
+      : public BitField<bool, FunctionVariableField::kNext, 1> {};
   class AsmFunctionField : public BitField<bool, AsmModuleField::kNext, 1> {};
   class HasSimpleParametersField
       : public BitField<bool, AsmFunctionField::kNext, 1> {};