Don't throw on assignment to function name binding in harmony sloppy mode

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 7cf81c4f0569b0d770bf6751cc3f26a814a2a9aa..914e7b0b2837e37720fa2f54032148abda70e6d3 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -4716,12 +4716,9 @@ ZoneList<Statement*>* Parser::ParseEagerFunctionBody(
     // NOTE: We create a proxy and resolve it here so that in the
     // future we can change the AST to only refer to VariableProxies
     // instead of Variables and Proxies as is the case now.
-    Token::Value fvar_init_op = Token::INIT_CONST_LEGACY;
-    bool use_strict_const = is_strict(scope_->language_mode()) ||
-                            (!allow_legacy_const() && allow_harmony_sloppy());
-    if (use_strict_const) {
-      fvar_init_op = Token::INIT_CONST;
-    }
+    const bool use_strict_const = is_strict(scope_->language_mode());
+    Token::Value fvar_init_op =
+        use_strict_const ? Token::INIT_CONST : Token::INIT_CONST_LEGACY;
     VariableMode fvar_mode = use_strict_const ? CONST : CONST_LEGACY;
     Variable* fvar = new (zone())
         Variable(scope_, function_name, fvar_mode, Variable::NORMAL,