[clang] [clang][bytecode] fix assertion failure on invalid init list (GH175432) (PR #180261)

[via cfe-commits]

Serosh-commits wrote:

> I can't give you a definitive answer to that, I'd have to try myself and see what tests break if I do that. I think it's weird that the declaration doesn't get marked as invalid but maybe that ends up being important, I don't know yet.

@tbaederr I understand the hesitation since it might have side effects If you think the Sema fix is too risky  what alternative approach would you suggest for solving the crash let me know 

https://github.com/llvm/llvm-project/pull/180261