Mangle template instantiations properly (as of VC 7.x) when compiling for

the Microsoft Visual C++ ABI. Currently limited to type and integral
non-type arguments. Based on a patch by Timur Iskhodzhanov!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157524 91177308-0d34-0410-b5e6-96231b3b80d8