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/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp
index c275668..87f7b8a 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -98,7 +98,7 @@
   return false;
 }
 
-unsigned PPCInstrInfo::isLoadFromStackSlot(MachineInstr *MI, 
+unsigned PPCInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, 
                                            int &FrameIndex) const {
   switch (MI->getOpcode()) {
   default: break;
@@ -116,7 +116,7 @@
   return 0;
 }
 
-unsigned PPCInstrInfo::isStoreToStackSlot(MachineInstr *MI, 
+unsigned PPCInstrInfo::isStoreToStackSlot(const MachineInstr *MI, 
                                           int &FrameIndex) const {
   switch (MI->getOpcode()) {
   default: break;