[llvm] [NFC] Add `const` for readability (PR #116611)

[Matt Arsenault via llvm-commits]

================
@@ -581,30 +581,30 @@ class InnerLoopVectorizer {
   virtual void printDebugTracesAtEnd() {}
 
   /// The original loop.
-  Loop *OrigLoop;
+  Loop *const OrigLoop;
 
   /// A wrapper around ScalarEvolution used to add runtime SCEV checks. Applies
   /// dynamic knowledge to simplify SCEV expressions and converts them to a
   /// more usable form.
   PredicatedScalarEvolution &PSE;
 
   /// Loop Info.
-  LoopInfo *LI;
+  LoopInfo *const LI;
----------------
arsenm wrote:

So basically this isn't const at all 

https://github.com/llvm/llvm-project/pull/116611