LAA: mark LoopInfo pointer const (NFC) (#100373)

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Differential Revision: https://phabricator.intern.facebook.com/D60250644

Author: artagnon

llvm/include/llvm/Analysis/ValueTracking.h

@@ -770,7 +770,7 @@ const Value *getUnderlyingObjectAggressive(const Value *V);
 /// it shouldn't look through the phi above.
 void getUnderlyingObjects(const Value *V,
                           SmallVectorImpl<const Value *> &Objects,
-                          LoopInfo *LI = nullptr, unsigned MaxLookup = 6);
+                          const LoopInfo *LI = nullptr, unsigned MaxLookup = 6);
 
 /// This is a wrapper around getUnderlyingObjects and adds support for basic
 /// ptrtoint+arithmetic+inttoptr sequences.

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -786,7 +786,8 @@ class AccessAnalysis {
   //intrinsic property (such as TBAA metadata).
   AliasSetTracker AST;
 
-  LoopInfo *LI;
+  /// The LoopInfo of the loop being checked.
+  const LoopInfo *LI;
 
   /// Sets of potentially dependent accesses - members of one set share an
   /// underlying pointer. The set "CheckDeps" identfies which sets really need a

llvm/lib/Analysis/ValueTracking.cpp

@@ -6580,7 +6580,7 @@ const Value *llvm::getUnderlyingObject(const Value *V, unsigned MaxLookup) {
 
 void llvm::getUnderlyingObjects(const Value *V,
                                 SmallVectorImpl<const Value *> &Objects,
-                                LoopInfo *LI, unsigned MaxLookup) {
+                                const LoopInfo *LI, unsigned MaxLookup) {
   SmallPtrSet<const Value *, 4> Visited;
   SmallVector<const Value *, 4> Worklist;
   Worklist.push_back(V);