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/Alpha/AlphaInstrInfo.h b/lib/Target/Alpha/AlphaInstrInfo.h
index abee722..b218873 100644
--- a/lib/Target/Alpha/AlphaInstrInfo.h
+++ b/lib/Target/Alpha/AlphaInstrInfo.h
@@ -36,8 +36,10 @@
   virtual bool isMoveInstr(const MachineInstr &MI,
                            unsigned &SrcReg, unsigned &DstReg) const;
   
-  virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
-  virtual unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const;
+  virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
+                                       int &FrameIndex) const;
+  virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
+                                      int &FrameIndex) const;
   
   virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                             MachineBasicBlock *FBB,