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335f67b652
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.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.