[RISCV] Add LD_RV32/SD_RV32 to a few more functions in RISCVInstrInfo. (#140640)

isLoadFromStackSlot/isStoreToStackSlot/getMemOperandsWithOffsetWidth

The first 2 probably requires spills/reloads which we don't use
LD_RV32/SD_RV32 for yet.

I think getMemOperandsWithOffsetWidth is mainly used for load/store
clustering. I think we can assume this just works.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfo.cpp

@@ -156,6 +156,7 @@ Register RISCVInstrInfo::isLoadFromStackSlot(const MachineInstr &MI,
     MemBytes = TypeSize::getFixed(4);
     break;
   case RISCV::LD:
+  case RISCV::LD_RV32:
   case RISCV::FLD:
     MemBytes = TypeSize::getFixed(8);
     break;
@@ -206,6 +207,7 @@ Register RISCVInstrInfo::isStoreToStackSlot(const MachineInstr &MI,
     MemBytes = TypeSize::getFixed(4);
     break;
   case RISCV::SD:
+  case RISCV::SD_RV32:
   case RISCV::FSD:
     MemBytes = TypeSize::getFixed(8);
     break;
@@ -3057,8 +3059,10 @@ bool RISCVInstrInfo::getMemOperandsWithOffsetWidth(
   case RISCV::SW_INX:
   case RISCV::FSW:
   case RISCV::LD:
+  case RISCV::LD_RV32:
   case RISCV::FLD:
   case RISCV::SD:
+  case RISCV::SD_RV32:
   case RISCV::FSD:
     break;
   default: