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b38ed1afa6
First, introduce a typedef `DiagnosticArgMap`. Second, make the `args` field public, and remove the `args` getter and `replace_args` setter. These were necessary previously because the getter had a `#[allow(rustc::potential_query_instability)]` attribute, but that was removed in #120931 when the args were changed from `FxHashMap` to `FxIndexMap`. (All the other `Diagnostic` fields are public.)
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.