diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -1904,11 +1904,11 @@
 
   /// Returns the name of the symbol used to emit stack probes or the empty
   /// string if not applicable.
-  virtual bool hasStackProbeSymbol(MachineFunction &MF) const { return false; }
+  virtual bool hasStackProbeSymbol(const MachineFunction &MF) const { return false; }
 
-  virtual bool hasInlineStackProbe(MachineFunction &MF) const { return false; }
+  virtual bool hasInlineStackProbe(const MachineFunction &MF) const { return false; }
 
-  virtual StringRef getStackProbeSymbolName(MachineFunction &MF) const {
+  virtual StringRef getStackProbeSymbolName(const MachineFunction &MF) const {
     return "";
   }
 
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -954,9 +954,9 @@
     MachineBasicBlock *emitProbedAlloca(MachineInstr &MI,
                                         MachineBasicBlock *MBB) const;
 
-    bool hasInlineStackProbe(MachineFunction &MF) const override;
+    bool hasInlineStackProbe(const MachineFunction &MF) const override;
 
-    unsigned getStackProbeSize(MachineFunction &MF) const;
+    unsigned getStackProbeSize(const MachineFunction &MF) const;
 
     ConstraintType getConstraintType(StringRef Constraint) const override;
 
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -11998,7 +11998,7 @@
   return MBB;
 }
 
-bool PPCTargetLowering::hasInlineStackProbe(MachineFunction &MF) const {
+bool PPCTargetLowering::hasInlineStackProbe(const MachineFunction &MF) const {
   // If the function specifically requests inline stack probes, emit them.
   if (MF.getFunction().hasFnAttribute("probe-stack"))
     return MF.getFunction().getFnAttribute("probe-stack").getValueAsString() ==
@@ -12006,7 +12006,7 @@
   return false;
 }
 
-unsigned PPCTargetLowering::getStackProbeSize(MachineFunction &MF) const {
+unsigned PPCTargetLowering::getStackProbeSize(const MachineFunction &MF) const {
   const TargetFrameLowering *TFI = Subtarget.getFrameLowering();
   unsigned StackAlign = TFI->getStackAlignment();
   assert(StackAlign >= 1 && isPowerOf2_32(StackAlign) &&
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.h b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -447,7 +447,7 @@
     // LD, and having the full constant in memory enables reg/mem opcodes.
     return VT != MVT::f64;
   }
-  bool hasInlineStackProbe(MachineFunction &MF) const override;
+  bool hasInlineStackProbe(const MachineFunction &MF) const override;
   bool isLegalICmpImmediate(int64_t Imm) const override;
   bool isLegalAddImmediate(int64_t Imm) const override;
   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
@@ -614,7 +614,7 @@
     return true;
   }
 
-  unsigned getStackProbeSize(MachineFunction &MF) const;
+  unsigned getStackProbeSize(const MachineFunction &MF) const;
 
 private:
   const SystemZSubtarget &Subtarget;
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -842,7 +842,7 @@
 }
 
 /// Returns true if stack probing through inline assembly is requested.
-bool SystemZTargetLowering::hasInlineStackProbe(MachineFunction &MF) const {
+bool SystemZTargetLowering::hasInlineStackProbe(const MachineFunction &MF) const {
   // If the function specifically requests inline stack probes, emit them.
   if (MF.getFunction().hasFnAttribute("probe-stack"))
     return MF.getFunction().getFnAttribute("probe-stack").getValueAsString() ==
@@ -7439,7 +7439,7 @@
 }
 
 unsigned
-SystemZTargetLowering::getStackProbeSize(MachineFunction &MF) const {
+SystemZTargetLowering::getStackProbeSize(const MachineFunction &MF) const {
   const TargetFrameLowering *TFI = Subtarget.getFrameLowering();
   unsigned StackAlign = TFI->getStackAlignment();
   assert(StackAlign >=1 && isPowerOf2_32(StackAlign) &&
diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -1455,11 +1455,11 @@
 
     bool supportKCFIBundles() const override { return true; }
 
-    bool hasStackProbeSymbol(MachineFunction &MF) const override;
-    bool hasInlineStackProbe(MachineFunction &MF) const override;
-    StringRef getStackProbeSymbolName(MachineFunction &MF) const override;
+    bool hasStackProbeSymbol(const MachineFunction &MF) const override;
+    bool hasInlineStackProbe(const MachineFunction &MF) const override;
+    StringRef getStackProbeSymbolName(const MachineFunction &MF) const override;
 
-    unsigned getStackProbeSize(MachineFunction &MF) const;
+    unsigned getStackProbeSize(const MachineFunction &MF) const;
 
     bool hasVectorBlend() const override { return true; }
 
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -56594,12 +56594,12 @@
 }
 
 /// Returns true if stack probing through a function call is requested.
-bool X86TargetLowering::hasStackProbeSymbol(MachineFunction &MF) const {
+bool X86TargetLowering::hasStackProbeSymbol(const MachineFunction &MF) const {
   return !getStackProbeSymbolName(MF).empty();
 }
 
 /// Returns true if stack probing through inline assembly is requested.
-bool X86TargetLowering::hasInlineStackProbe(MachineFunction &MF) const {
+bool X86TargetLowering::hasInlineStackProbe(const MachineFunction &MF) const {
 
   // No inline stack probe for Windows, they have their own mechanism.
   if (Subtarget.isOSWindows() ||
@@ -56617,7 +56617,7 @@
 /// Returns the name of the symbol used to emit stack probes or the empty
 /// string if not applicable.
 StringRef
-X86TargetLowering::getStackProbeSymbolName(MachineFunction &MF) const {
+X86TargetLowering::getStackProbeSymbolName(const MachineFunction &MF) const {
   // Inline Stack probes disable stack probe call
   if (hasInlineStackProbe(MF))
     return "";
@@ -56640,7 +56640,7 @@
 }
 
 unsigned
-X86TargetLowering::getStackProbeSize(MachineFunction &MF) const {
+X86TargetLowering::getStackProbeSize(const MachineFunction &MF) const {
   // The default stack probe size is 4096 if the function has no stackprobesize
   // attribute.
   unsigned StackProbeSize = 4096;