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_mir_dataflow/src/move_paths/builder.rs

@@ -481,6 +481,7 @@ impl<'a, 'tcx, F: Fn(Ty<'tcx>) -> bool> MoveDataBuilder<'a, 'tcx, F> {
                 }
             }
             TerminatorKind::InlineAsm {
+                asm_macro: _,
                 template: _,
                 ref operands,
                 options: _,