[C++11] Adding override specifiers where appropriate, and removing virtual specifiers where not needed.

No functional changes intended.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203122 91177308-0d34-0410-b5e6-96231b3b80d8
Fix operator<< recognition (PR19064).


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203123 91177308-0d34-0410-b5e6-96231b3b80d8
[ASTPrinter] 'SEL' isn't a ObjCObjectPointer, so we don't need to handle it in TypePrinter::printObjCObjectPointerBefore.

Suggested by Jordan.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203124 91177308-0d34-0410-b5e6-96231b3b80d8