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Noticed while porting the CHERI-Generic tests to Morello:

LLVM ERROR: Cannot select: t5: iFATPTR128,ch = AtomicSwap<(load store monotonic 16 on %ir.ptr, addrspace 200)> t0, t2, t4
  t2: iFATPTR128,ch = CopyFromReg t0, Register:iFATPTR128 %0
    t1: iFATPTR128 = Register %0
  t4: iFATPTR128,ch = CopyFromReg t0, Register:iFATPTR128 %1
    t3: iFATPTR128 = Register %1
In function: atomic_cap_ptr_xchg_relaxed

define i32 addrspace(200)* @atomic_cap_ptr_xchg_relaxed(i32 addrspace(200)* addrspace(200)* %ptr, i32 addrspace(200)* %val) nounwind {
bb:
  %tmp = atomicrmw xchg i32 addrspace(200)* addrspace(200)* %ptr, i32 addrspace(200)* %val monotonic
  ret i32 addrspace(200)* %tmp
}