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5ad2f434dc
To make debugger stepping intuitive with `-Copt-level=0`. See the adjusted `basic-stepping.rs` test. This is kind of a revert of bd0aae92dc76d9, except we don't revert it, we just make it conditional on `opt-level`. That commit regressed `basic-stepping.rs`, but it was not noticed since that test did not exist back then. I have retroactively bisected to find that out. It seems messy to sprinkle if-cases inside of the `write_operand_repeatedly()` so make the whole function conditional. The test that bd0aae92dc76d9 added in `tests/codegen/issues/issue-111603.rs` already use `-Copt-level=3`, so we don't need to adjust the compiler flags for it to keep passing.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.