Make TargetInstrInfo::isPredicable take a const reference, NFC

llvm-svn: 296901
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 0e2ed59..16ffd04 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -727,7 +727,7 @@
   return true;
 }
 
-bool SystemZInstrInfo::isPredicable(MachineInstr &MI) const {
+bool SystemZInstrInfo::isPredicable(const MachineInstr &MI) const {
   unsigned Opcode = MI.getOpcode();
   if (Opcode == SystemZ::Return ||
       Opcode == SystemZ::Trap ||
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.h b/llvm/lib/Target/SystemZ/SystemZInstrInfo.h
index b07f101..3fb7880 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.h
@@ -215,7 +215,7 @@
                     unsigned FalseReg) const override;
   bool FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI, unsigned Reg,
                      MachineRegisterInfo *MRI) const override;
-  bool isPredicable(MachineInstr &MI) const override;
+  bool isPredicable(const MachineInstr &MI) const override;
   bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
                            unsigned ExtraPredCycles,
                            BranchProbability Probability) const override;