4c65eef269
`f16` and `f128` step 2: intrinsics Continuation of https://github.com/rust-lang/rust/pull/121728, another portion of https://github.com/rust-lang/rust/pull/114607. This PR adds `f16` and `f128` intrinsics, and hooks them up to both HIR and LLVM. This is all still unexposed to the frontend, which will probably be the next step. Also update itanium mangling per `@rcvalle's` in https://github.com/rust-lang/rust/pull/121728/files#r1506570300, and fix a typo from step 1. Once these types are usable in code, I will add the codegen tests from #114607 (codegen is passing on that branch) This does add more `unimplemented!`s to Clippy, but I still don't think we can do better until library support is added. r? `@compiler-errors` cc `@Nilstrieb` `@rustbot` label +T-compiler +F-f16_and_f128
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