[AArch64][SVE] Fix diagnostic for SVE LD4 instructions:

Diagnostic:
  'index must be multiple of 3 in range [-32, 28]'

Must be:
  'index must be multiple of 4 in range [-32, 28]'



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330407 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed