[llvm] improve debug messages in delinearization and dependence analysis (NFC) (PR #156339)

[Ryotaro Kasuga via llvm-commits]

================
@@ -683,22 +676,33 @@ bool llvm::getIndexExpressionsFromGEP(ScalarEvolution &SE,
           continue;
         }
       Subscripts.push_back(Expr);
+      LLVM_DEBUG(dbgs() << "Subscripts push_back: " << *Expr << "\n");
       continue;
     }
 
     auto *ArrayTy = dyn_cast<ArrayType>(Ty);
     if (!ArrayTy) {
+      LLVM_DEBUG(dbgs() << "GEP delinearize failed: " << *Ty
+                        << " is not an array type.\n");
       Subscripts.clear();
       Sizes.clear();
       return false;
     }
 
     Subscripts.push_back(Expr);
+    LLVM_DEBUG(dbgs() << "Subscripts push_back: " << *Expr << "\n");
----------------
kasuga-fj wrote:

Same here

https://github.com/llvm/llvm-project/pull/156339