[clang] [clang][ObjC][CodeComplete] Fix crash on C-Style cast with parenthesized operand in ObjC++ (PR #180343)

[Oliver Hunt via cfe-commits]

https://github.com/ojhunt approved this pull request.

looks good, thanks! Do you need someone to press the merge button?

https://github.com/llvm/llvm-project/pull/180343