[SCCPSolver] Mark several functions const (NFC) (#140926)

Author: kazutakahirata

llvm/include/llvm/Transforms/Utils/SCCPSolver.h

@@ -143,11 +143,12 @@ class SCCPSolver {
 
   /// getTrackedGlobals - Get and return the set of inferred initializers for
   /// global variables.
-  const DenseMap<GlobalVariable *, ValueLatticeElement> &getTrackedGlobals();
+  const DenseMap<GlobalVariable *, ValueLatticeElement> &
+  getTrackedGlobals() const;
 
   /// getMRVFunctionsTracked - Get the set of functions which return multiple
   /// values tracked by the pass.
-  const SmallPtrSet<Function *, 16> &getMRVFunctionsTracked();
+  const SmallPtrSet<Function *, 16> &getMRVFunctionsTracked() const;
 
   /// markOverdefined - Mark the specified value overdefined.  This
   /// works with both scalars and structs.

llvm/lib/Transforms/Utils/SCCPSolver.cpp

@@ -839,15 +839,16 @@ class SCCPInstVisitor : public InstVisitor<SCCPInstVisitor> {
     return I->second;
   }
 
-  const MapVector<Function *, ValueLatticeElement> &getTrackedRetVals() {
+  const MapVector<Function *, ValueLatticeElement> &getTrackedRetVals() const {
     return TrackedRetVals;
   }
 
-  const DenseMap<GlobalVariable *, ValueLatticeElement> &getTrackedGlobals() {
+  const DenseMap<GlobalVariable *, ValueLatticeElement> &
+  getTrackedGlobals() const {
     return TrackedGlobals;
   }
 
-  const SmallPtrSet<Function *, 16> &getMRVFunctionsTracked() {
+  const SmallPtrSet<Function *, 16> &getMRVFunctionsTracked() const {
     return MRVFunctionsTracked;
   }
 
@@ -2226,11 +2227,11 @@ SCCPSolver::getTrackedRetVals() const {
 }
 
 const DenseMap<GlobalVariable *, ValueLatticeElement> &
-SCCPSolver::getTrackedGlobals() {
+SCCPSolver::getTrackedGlobals() const {
   return Visitor->getTrackedGlobals();
 }
 
-const SmallPtrSet<Function *, 16> &SCCPSolver::getMRVFunctionsTracked() {
+const SmallPtrSet<Function *, 16> &SCCPSolver::getMRVFunctionsTracked() const {
   return Visitor->getMRVFunctionsTracked();
 }