Fix exception for assignment to uninitialised const

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index 84eb02c94c95b86f00200b1f9d3ef2bd16466c60..42f2b2c9233561c7054551b73205b37f97c12eba 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -589,19 +589,6 @@ class FullCodeGenerator: public AstVisitor {
   // is expected in the accumulator.
   void EmitAssignment(Expression* expr);
 
-  // Shall an error be thrown if assignment with 'op' operation is perfomed
-  // on this variable in given language mode?
-  static bool IsSignallingAssignmentToConst(Variable* var, Token::Value op,
-                                            LanguageMode language_mode) {
-    if (var->mode() == CONST) return op != Token::INIT_CONST;
-
-    if (var->mode() == CONST_LEGACY) {
-      return is_strict(language_mode) && op != Token::INIT_CONST_LEGACY;
-    }
-
-    return false;
-  }
-
   // Complete a variable assignment.  The right-hand-side value is expected
   // in the accumulator.
   void EmitVariableAssignment(Variable* var,