Remove CONST_LEGACY VariableMode

src/ast/variables.h

Index: src/ast/variables.h
diff --git a/src/ast/variables.h b/src/ast/variables.h
index 950db3c0021263f93209609d24cfd61de8a2d58f..420097484e06b22cf389c889ec0281253df661ea 100644
--- a/src/ast/variables.h
+++ b/src/ast/variables.h
@@ -17,7 +17,7 @@ namespace internal {
 // after binding and variable allocation.
 class Variable: public ZoneObject {
  public:
-  enum Kind { NORMAL, FUNCTION, THIS, ARGUMENTS };
+  enum Kind { NORMAL, FUNCTION, THIS, ARGUMENTS, SLOPPY_FUNCTION_NAME };
 
   Variable(Scope* scope, const AstRawString* name, VariableMode mode, Kind kind,
            InitializationFlag initialization_flag,
@@ -71,10 +71,12 @@ class Variable: public ZoneObject {
   bool IsStaticGlobalObjectProperty() const;
 
   bool is_dynamic() const { return IsDynamicVariableMode(mode_); }
-  bool is_const_mode() const { return IsImmutableVariableMode(mode_); }
   bool binding_needs_init() const {
     return initialization_flag_ == kNeedsInitialization;
   }
+  bool throw_on_const_assignment(LanguageMode language_mode) const {
+    return kind_ != SLOPPY_FUNCTION_NAME || is_strict(language_mode);
+  }
 
   bool is_function() const { return kind_ == FUNCTION; }
   bool is_this() const { return kind_ == THIS; }