As discussed in D99250 , we added a new tuning debugger DBX(D99400) to add some debug info customizations for DBX on AIX.
This is part of the customizations, not generating DWARF infos not matching the DWARF version.
This is for DW_TAG_rvalue_reference_type tag.
Now for DBX, we only generate this tag when DWARF version is 4 or higher.
Rather than adding a cast here, perhaps the parameter type could be updated? (maybe in a separate preliminary commit, though, so as not to muddy this one)