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3f33b30e19
Add `unchecked_disjoint_bitor` per ACP373 Following the names from libs-api in https://github.com/rust-lang/libs-team/issues/373#issuecomment-2085686057 Includes a fallback implementation so this doesn't have to update cg_clif or cg_gcc, and overrides it in cg_llvm to use `or disjoint`, which [is available in LLVM 18](https://releases.llvm.org/18.1.0/docs/LangRef.html#or-instruction) so hopefully we don't need any version checks.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.