Question for anyone here who knows a thing or two about `riscv-rt` - I'm currently using this for a `riscv32imfc-unknown-none-elf` target, but I'm having some issues. First one was that the floating point stuff wasn't getting preserved because of the LLVM/Rust bugs mentioned in `src/asm.rs`, but that was fixed easily enough by adding
```rs
    #[cfg(all(riscv32, riscvf))]
    ".attribute arch, \"rv32imfc\"",
    #[cfg(all(riscv64, riscvf))]
    ".attribute arch, \"rv64imfc\"",
    #[cfg(all(riscv64, riscvd))]
    ".attribute arch, \"rv64imdc\"",
```
to the provisional patch `cfg_global_asm!()` section. However now I'm getting a fun issue with `symbol 'ExceptionHandler' is already defined` and `symbol 'DefaultHandler' is already defined`, which only seems to be a problem if setting `lto = true`. Any advice on resolving this?