Emit an error when trying to form a pointer-to-member to a bitfield.

As a bonus, avoids a crash on the IRGen side due to accepting invalid code.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@117842 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed