[llvm] r195798 - Use simple section names for COMDAT sections on COFF.

[Rafael Espíndola]

> Please add the test to make sure you have not broke the old behavior
> with .tls*, which was here for a reason.

It would be nice to test that reason.

Clang produces an error if we try to use TLS. gcc uses
".data$__emutls_v.<symbol>", so we were not even close. I have fixed
the code to use the same name as msvc in r195849 and added a test.

Cheers,
Rafael