[AArch64 NEON] Fix a bug about vcles_f32 and vcled_f64.

As vcles_f32() and vcled_f64 are implemented by FCMGE, operands
should make a swap.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199866 91177308-0d34-0410-b5e6-96231b3b80d8