Replacing movqu on Arm

This instruction is used to move unaligned double quadwords to, achieving data copy between registers and from registers to addresses.

• Instruction on x86:

  MOVDQU xmm1, xmm2/m128

• Alternatives on Arm:

  Instruction ldp: Load Pair Registers (extended): loads two doublewords from memory addressed by addr to Xt1 and Xt2.

  LDP Xt1, Xt2, addr

  Instruction stp: Store Pair Registers (extended): stores two doublewords from Xt1 and Xt2 to memory addressed by addr.

  STP Xt1, Xt2, addr