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edb669350a
rustc_target: Add sme-b16b16 as an explicit aarch64 target feature LLVM 20 split out what used to be called b16b16 and correspond to aarch64 FEAT_SVE_B16B16 into sve-b16b16 and sme-b16b16. Add sme-b16b16 as an explicit feature and update the codegen accordingly. Resolves https://github.com/rust-lang/rust/pull/129894.
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.