Adapt codegen test to accept operand bundles

[TimNN]

The updated test current fails when rustc is built with HEAD LLVM: https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/44013/steps/canvas?sid=019cafec-3cca-44b2-aa9f-b41c0a940e8b

Likely as a result of llvm/llvm-project#169923

Since the new codegen merges two lines into one, I couldn't figure out a way to make the test work on both LLVM versions without introducing revisions. (Though I could instead make the test run on only LLVM 23+).

@rustbot label llvm-main

[rustbot]

r? @Mark-Simulacrum

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