message: Fix warning about zero-sized FDEs.
diff: @@ -82,10 +82,8 @@ impl UnwindRegistry {
  let len = std::ptr::read::<u32>(current as *const u32) as usize;
  // Skip over the CIE
  - if current != start {
  - // If len == 0, __register_frame will be a no-op.
  - // So rather than skip it here, we just let __register_frame
  - // deal with empty FDEs the way they want.
  + // LLVM's libunwind emits a warning on zero-sized FDEs.
  + if current != start && len != 0 {
  __register_frame(current);
  self.registrations.push(current as usize);
  }
  