Test that we print MS keyword attributes without a __declspec(...) adornment.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173754 91177308-0d34-0410-b5e6-96231b3b80d8
Fold tests for C++ 'main' into a single file.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173756 91177308-0d34-0410-b5e6-96231b3b80d8
PR15100: look through type sugar when determining whether we have one of the
forms of 'main' which we accept as an extension.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173758 91177308-0d34-0410-b5e6-96231b3b80d8