[AArch64]Fix the problem can't select concat_vectors of two v1i32 types.
Also fix the problem can't select scalar_to_vector from f32 to v2f32/v4f32.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199461 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64 NEON] Custom lower conversion between vector integer and vector floating point if element bit-width doesn't match.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199462 91177308-0d34-0410-b5e6-96231b3b80d8