Add `bool isv` parameter to Dsymbol::mangle()
fix Issue 8847 - voldemort + inout confuses "is"
Mangle pre-inference attributes for Voldemort types.
fix incorrect use of _WIN32
Merge pull request #1606 from WalterBright/refactor6

fix incorrect use of _WIN32
Merge remote-tracking branch '9rnsr/fix8847'