Fix typo-correction crash if a typo occurs within the operand of a

Fix typo-correction crash if a typo occurs within the operand of a
function-style cast to a non-dependent type which is then used in an invalid
way. We'd lose the "type dependent" bit here, and downstream Sema processing
would then discard the expression if it was used in a context where its type
rendered it invalid.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274267 91177308-0d34-0410-b5e6-96231b3b80d8