[RISCV][GISel] Pass APInt by const reference. NFC

Author: topperc

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

@@ -670,7 +670,7 @@ bool RISCVLegalizerInfo::legalizeVAStart(MachineInstr &MI,
   return true;
 }
 
-bool RISCVLegalizerInfo::shouldBeInConstantPool(APInt APImm,
+bool RISCVLegalizerInfo::shouldBeInConstantPool(const APInt &APImm,
                                                 bool ShouldOptForSize) const {
   assert(APImm.getBitWidth() == 32 || APImm.getBitWidth() == 64);
   int64_t Imm = APImm.getSExtValue();

llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.h

@@ -38,7 +38,7 @@ class RISCVLegalizerInfo : public LegalizerInfo {
                          MachineInstr &MI) const override;
 
 private:
-  bool shouldBeInConstantPool(APInt APImm, bool ShouldOptForSize) const;
+  bool shouldBeInConstantPool(const APInt &APImm, bool ShouldOptForSize) const;
   bool legalizeShlAshrLshr(MachineInstr &MI, MachineIRBuilder &MIRBuilder,
                            GISelChangeObserver &Observer) const;