message: Update llvm_asm to asm for aarch64
diff: @@ -201,11 +201,9 @@ impl Tcb {
  unsafe fn arch_read(offset: usize) -> usize {
  // TODO: s/llvm_asm/asm/g
  let tp: usize;
  - llvm_asm!("mrs $0, tpidr_el0"
  - : "=r"(tp)
  - :
  - :
  - : "volatile"
  + asm!(
  + "mrs {}, tpidr_el0",
  + out(reg) tp,
  );
  *((tp + offset) as *const usize)
  