Add more const qualifiers. This fixes build breakage from r59540.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59542 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index dc76f3e..cf8be96 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -290,14 +290,14 @@
   //
   bool isMoveInstr(const MachineInstr& MI, unsigned& sourceReg,
                    unsigned& destReg) const;
-  unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
-  unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const;
+  unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+  unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
 
   bool isReallyTriviallyReMaterializable(const MachineInstr *MI) const;
   void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
                      unsigned DestReg, const MachineInstr *Orig) const;
 
-  bool isInvariantLoad(MachineInstr *MI) const;
+  bool isInvariantLoad(const MachineInstr *MI) const;
 
   /// convertToThreeAddress - This method must be implemented by targets that
   /// set the M_CONVERTIBLE_TO_3_ADDR flag.  When this flag is set, the target