#[patchable_function_entries]
See [RFC](https://github.com/maurer/rust-rfcs/blob/patchable-function-entry/text/0000-patchable-function-entry.md) (yet to be numbered) TODO before submission: * Needs an RFC * Improve error reporting for malformed attributes
`-Z patchable-function-entry` works like `-fpatchable-function-entry` on clang/gcc. The arguments are total nop count and function offset. See MCP rust-lang/compiler-team#704