[Pass] add LoopUnrollAndRemainder pass

Author: chen.qian

llvm/lib/Target/RISCV/CMakeLists.txt

@@ -39,6 +39,7 @@ add_llvm_target(RISCVCodeGen
   RISCVGatherScatterLowering.cpp
   RISCVSplitLoopByLength.cpp
   RISCVCustomLICM.cpp
+  RISCVLoopUnrollAndRemainder.cpp
   RISCVInsertVSETVLI.cpp
   RISCVInsertReadWriteCSR.cpp
   RISCVInsertWriteVXRM.cpp