Revert "[MS ABI] Allow fastcall member function pointers to get CodeGen'd"

Revert "[MS ABI] Allow memfn pointers with unconvertible types to be formed"

This reverts r239499 and r239503; the former breaks tests [1] and the
latter is based on the former.

[1]
http://lab.llvm.org:8080/green/job/clang-stage2-configure-Rlto_check/4473/testReport/Clang/CodeGenCXX/microsoft_abi_virtual_member_pointers_cpp/

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239511 91177308-0d34-0410-b5e6-96231b3b80d8