Do not walk through member-accesses on bitfields when looking for the object
which is lifetime-extended by a reference binding. An additional temporary is
created for such a bitfield access (although we have no explicit AST
representation for it).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183095 91177308-0d34-0410-b5e6-96231b3b80d8