[parsing] Be less pessimistic about maybe_assigned of parameters.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 15ea1469142f0776952cd4d1f553cbd77c39cc10..af20dee0a32d3dd7fe8590480aaa9cdb838b9ff2 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -1074,12 +1074,6 @@ class V8_EXPORT_PRIVATE Parser : public NON_EXPORTED_BASE(ParserBase<Parser>) {
         classifier()->RecordDuplicateFormalParameterError(
             scanner()->location());
       }
-      if (is_sloppy(scope->language_mode())) {
-        // TODO(sigurds) Mark every parameter as maybe assigned. This is a
-        // conservative approximation necessary to account for parameters
-        // that are assigned via the arguments array.
-        var->set_maybe_assigned();
-      }
     }
   }