When mangling function template specialization, mangle the type encoding of the original function template. Also, port mangle.cpp and function-template-specialization.cpp over to using FileCheck.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82114 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed