AArch64 "Undefined HINT instruction found" running simple Java app

I ran the ReadWrite.java from https://github.com/DynamoRIO/dynamorio/issues/5309#issue-1119299130 on our Jenkins machine and it has several of these warnings:

<Undefined HINT instruction found: encoding 0xd503245f (CRm:op2 0x22)
>
<Undefined HINT instruction found: encoding 0xd503245f (CRm:op2 0x22)
>
<Undefined HINT instruction found: encoding 0xd503245f (CRm:op2 0x22)
>
<Undefined HINT instruction found: encoding 0xd503245f (CRm:op2 0x22)
>

I didn't look up what this hint does: does DR need to take any action there or this is just a missing innocuous opcode?

$ disasm_a64 d503245f
llvm-mc:   d503245f hint #34
capstone:  d503245f hint #0x22
bfd:       d503245f bti c
DynamoRIO: d503245f xx $0xd503245f %sp %x2 %x9 %x3 -> %sp %x2 %x9 %x3