Silence MSVC warning on missing return after fully covered switch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221943 91177308-0d34-0410-b5e6-96231b3b80d8
Relax the gcov version.ll test to check '.' instead of '\*'

The escaping of the '\*' doesn't work with my combination of testing
tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221944 91177308-0d34-0410-b5e6-96231b3b80d8