[AArch64][SVE] Fix crash for DestructiveBinaryComm zero merging

This fix is similar to D124325, and I find the DestructiveBinaryComm
operation type also may be allocated same register, so insert the LSL.

      movprfx       z0.s, p0/z, z0.s
      lsl z0.b, p0/m, z0.b, #0
      fmul z0.s, p0/m, z0.s, z0.s

Reviewed By: paulwalker-arm

Differential Revision: https://reviews.llvm.org/D141471