[ptr-compr] Fix --no-debug-code issue with loading JSArray::length

Bug: v8:9717
Change-Id: I0d99cb8f8dedd22dae9f78b49a097e3dcbba02bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1807368Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63840}

src/builtins/builtins-array-gen.cc

@@ -245,9 +245,7 @@ TF_BUILTIN(ArrayPrototypePop, CodeStubAssembler) {
   BIND(&fast);
   {
     TNode<JSArray> array_receiver = CAST(receiver);
-    CSA_ASSERT(this, TaggedIsPositiveSmi(LoadJSArrayLength(array_receiver)));
-    TNode<IntPtrT> length =
-        LoadAndUntagObjectField(array_receiver, JSArray::kLengthOffset);
+    TNode<IntPtrT> length = SmiUntag(LoadFastJSArrayLength(array_receiver));
     Label return_undefined(this), fast_elements(this);
     GotoIf(IntPtrEqual(length, IntPtrConstant(0)), &return_undefined);