[clang] [Clang][NFC] Extend cmplx range tests for #131129 (PR #131447)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

> I can experiment with --filter-out, but I'd prefer to do that as a followup.

If you want, you can run the IR through "opt -passes=mem2reg" or something... we just don't want to run the full optimization pipeline because that leads to a bunch of spurious changes to clang tests whenever the optimizer is changed.

https://github.com/llvm/llvm-project/pull/131447