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98da8e60eb
Change `tag_field` to `FieldIdx` in `Variants::Multiple` It was already available as a generic parameter anyway, and it's not like we'll ever put a tag in the 5-billionth field. This is a first part of pulling smaller pieces out of rust-lang/rust#138759, so r? workingjubilee
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.