message: Fix allocated reg in AT&T style asm
diff: @@ -438,6 +438,9 @@ fn generate_asm_wrapper(&self, asm_name: &str) -> String {
  generated_asm.push_str(s);
  }
  InlineAsmTemplatePiece::Placeholder { operand_idx, modifier, span: _ } => {
  + if self.options.contains(InlineAsmOptions::ATT_SYNTAX) {
  + generated_asm.push('%');
  + }
  self.registers[*operand_idx]
  .unwrap()
  .emit(&mut generated_asm, self.arch, *modifier)
  