[Bug 44202] undname.c fails to parse symbols with rvalue-reference semantics '&&'

https://bugs.winehq.org/show_bug.cgi?id=44202

--- Comment #9 from Eric Zhang  ---
Using undname tool on Windows to demangle
"??4QDnsDomainNameRecord@@QAEAAV0@$$QAV0@@Z" is successful with result as
"public: class QDnsDomainNameRecord & __thiscall
QDnsDomainNameRecord::operator=(class QDnsDomainNameRecord &&)".

However tests on Windows failed with:
msvcrt_crosstest:
cpp.c:1341: Test failed: 131: Got name
"??4QDnsDomainNameRecord@@QAEAAV0@$$QAV0@@Z"
cpp.c:1344: Test failed: 131: Expected "public: class QDnsDomainNameRecord &
__thiscall QDnsDomainNameRecord::operator=(class QDnsDomainNameRecord &&)"