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/ARM/ARMInstrInfo.cpp b/lib/Target/ARM/ARMInstrInfo.cpp
index 18ab594..e78f2d3 100644
--- a/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/lib/Target/ARM/ARMInstrInfo.cpp
@@ -73,7 +73,8 @@
   }
 }
 
-unsigned ARMInstrInfo::isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const{
+unsigned ARMInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
+                                           int &FrameIndex) const {
   switch (MI->getOpcode()) {
   default: break;
   case ARM::LDR:
@@ -107,7 +108,8 @@
   return 0;
 }
 
-unsigned ARMInstrInfo::isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
+unsigned ARMInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
+                                          int &FrameIndex) const {
   switch (MI->getOpcode()) {
   default: break;
   case ARM::STR: