[clang] [CIR] Correctly pass func self-comdat & alignment (PR #223773)

[Andy Kaylor via cfe-commits]

================
@@ -2933,6 +2947,9 @@ void cir::FuncOp::print(OpAsmPrinter &p) {
   if (getComdat())
----------------
andykaylor wrote:

I don't understand how/if the new comdat handling is preserved through serialization. Is it just always computed during lowering to LLVM?

https://github.com/llvm/llvm-project/pull/223773