More -Wuninitialized updates

Fix r216438 to catch more complicated self-initialized in std::move.  For
instance, "Foo f = std::move(cond ? OtherFoo : (UNUSED_VALUE, f));"

Make sure that BinaryConditionalOperator, ConditionalOperator, BinaryOperator
with comma operator, and OpaqueValueExpr perform the correct usage forwarding
across the three uninitialized value checkers.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216627 91177308-0d34-0410-b5e6-96231b3b80d8