use getFixedValue() from size directly

Author: jiahanxie353

llvm/lib/Target/RISCV/GISel/RISCVRegisterBankInfo.cpp

@@ -318,8 +318,7 @@ RISCVRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
 
     OpdsMapping[1] = GPRValueMapping;
     // Use FPR64 for s64 loads on rv32.
-    if (!Ty.isVector() && GPRSize == 32 &&
-        Ty.getSizeInBits().getFixedValue() == 64) {
+    if (!Ty.isVector() && GPRSize == 32 && Size.getFixedValue() == 64) {
       assert(MF.getSubtarget<RISCVSubtarget>().hasStdExtD());
       OpdsMapping[0] = getFPValueMapping(Ty.getSizeInBits());
       break;
@@ -347,8 +346,7 @@ RISCVRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
 
     OpdsMapping[1] = GPRValueMapping;
     // Use FPR64 for s64 stores on rv32.
-    if (!Ty.isVector() && GPRSize == 32 &&
-        Ty.getSizeInBits().getFixedValue() == 64) {
+    if (!Ty.isVector() && GPRSize == 32 && Size.getFixedValue() == 64) {
       assert(MF.getSubtarget<RISCVSubtarget>().hasStdExtD());
       OpdsMapping[0] = getFPValueMapping(Ty.getSizeInBits());
       break;