various fixes for naked_asm! implementation

- fix for divergence
- fix error message
- fix another cranelift test
- fix some cranelift things
- don't set the NORETURN option for naked asm
- fix use of naked_asm! in doc comment
- fix use of naked_asm! in run-make test
- use `span_bug` in unreachable branch

compiler/rustc_smir/src/rustc_smir/convert/mir.rs

@@ -655,6 +655,7 @@ impl<'tcx> Stable<'tcx> for mir::TerminatorKind<'tcx> {
                 }
             }
             mir::TerminatorKind::InlineAsm {
+                asm_macro: _,
                 template,
                 operands,
                 options,