[CodeGen] Add OPC_MoveChild0-OPC_MoveChild7 opcodes to isel matching tables to optimize table size. Shaves about 12K off the X86 matcher table.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268209 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed