Implement C++ 10.3p16 - overrides involving deleted functions must match.

Only deleted functions may override deleted functions and non-deleted functions
may only override non-deleted functions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166082 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed