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Add a hook for `should_codegen_locally` This PR lifts the module-local function `should_codegen_locally` to `TyCtxt` as a hook. In addition to monomorphization, this function is used for checking the dependency of `compiler_builtins` on other libraries. Moving this function to the hooks also makes overriding it possible for the tools that use the rustc interface.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.