[PATCH] MC asm parser: allow @'s in symbol names in MS assembly

[Rafael Espíndola]

> I could do this in an independent change, but I think it ties in nicely with the test I'm adding here. Happy to split it out if you think it's important though.

Nah, it is fine. Just add a test showing we accept in on ELF too with
a comment saying it is an extension.

Cheers,
Rafael