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.cpp b/lib/Target/Alpha/AlphaInstrInfo.cpp
index b365aba..7b3053e 100644
--- a/lib/Target/Alpha/AlphaInstrInfo.cpp
+++ b/lib/Target/Alpha/AlphaInstrInfo.cpp
@@ -49,7 +49,8 @@
 }
 
 unsigned 
-AlphaInstrInfo::isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const {
+AlphaInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
+                                    int &FrameIndex) const {
   switch (MI->getOpcode()) {
   case Alpha::LDL:
   case Alpha::LDQ:
@@ -67,7 +68,8 @@
 }
 
 unsigned 
-AlphaInstrInfo::isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
+AlphaInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
+                                   int &FrameIndex) const {
   switch (MI->getOpcode()) {
   case Alpha::STL:
   case Alpha::STQ: