Add an Extension warning for applying unary * to an operand of type 'void*' in
C++. This seems like a pointless (and indeed harmful) restriction to me, so
I've suggested removing it to -core and disabled this diagnostic by default.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208254 91177308-0d34-0410-b5e6-96231b3b80d8