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Auto merge of #112516 - erikdesjardins:loop, r=davidtwco
cg_llvm: use index-based loop in write_operand_repeatedly
This should be easier for LLVM to analyze.
Fixes #111603
This needs a perf run.
[cc](https://github.com/rust-lang/rust/issues/111603#issuecomment-1567531178) `@caojoshua`
