[llvm-stress][opaque pointers] Remove use of deprecated constructor

(See also D76269.)
diff --git a/llvm/tools/llvm-stress/llvm-stress.cpp b/llvm/tools/llvm-stress/llvm-stress.cpp
index 5f36a78..67bc0d2 100644
--- a/llvm/tools/llvm-stress/llvm-stress.cpp
+++ b/llvm/tools/llvm-stress/llvm-stress.cpp
@@ -343,7 +343,9 @@
   void Act() override {
     // Try to use predefined pointers. If non-exist, use undef pointer value;
     Value *Ptr = getRandomPointerValue();
-    Value *V = new LoadInst(Ptr, "L", BB->getTerminator());
+    PointerType *Tp = cast<PointerType>(Ptr->getType());
+    Value *V = new LoadInst(Tp->getElementType(), Ptr, "L",
+                            BB->getTerminator());
     PT->push_back(V);
   }
 };