[RISCV][NFC] Put isSImm6 and simm6 td definition in correct sorted position

We sort these helper functions and td definitions by bit width. simm6 was
previously out-of-order with respect to the others.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320559 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed