[RISCV] Expand divisions larger than 64 bits on RV32. (llvm#163688)

The __(u)divti3, __(u)modti3 functions don't exist in libgcc for RV32.

Author: topperc

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -1672,6 +1672,8 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
   if (Subtarget.useRVVForFixedLengthVectors())
     setTargetDAGCombine(ISD::BITCAST);
 
+  setMaxDivRemBitWidthSupported(Subtarget.is64Bit() ? 128 : 64);
+
   // Disable strict node mutation.
   IsStrictFPEnabled = true;
   EnableExtLdPromotion = true;