Auto merge of #110523 - ecnelises:llvm_isa_fix, r=cuviper

Replace LLVM any_isa with any_cast

Per https://github.com/rust-lang/llvm-project/blob/585a6eb3ebf7c40fd7c1b23e3ece557b3cc2aa36/llvm/include/llvm/ADT/Any.h#L130 , `any_isa` has been deprecated in LLVM. Use `any_cast` instead to avoid warnings.