[TurboFan] Relax DCHECK that is too strong

Bug: chromium:1170261
Change-Id: Id2c5d18df892ece2823f7784dee4e69e54b7454c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2652491
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72368}

src/compiler/representation-change.cc

@@ -1105,7 +1105,7 @@ Node* RepresentationChanger::GetWord64RepresentationFor(
     // BigInts are only represented as tagged pointer and word64.
     if (!CanBeTaggedPointer(output_rep) &&
         output_rep != MachineRepresentation::kWord64) {
-      DCHECK(!output_type.Is(Type::BigInt()));
+      DCHECK(!output_type.Equals(Type::BigInt()));
       Node* unreachable =
           InsertUnconditionalDeopt(use_node, DeoptimizeReason::kNotABigInt);
       return jsgraph()->graph()->NewNode(

test/mjsunit/regress/regress-1170261.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --allow-natives-syntax
+
+function foo(unused1, unused2, bigint) {
+    const temp = -bigint;
+}
+
+function bar() {
+    const arr = Array();
+    const obj = Object();
+    arr.reduce(foo, 0)
+}
+
+%PrepareFunctionForOptimization(foo);
+foo(0, 0, 2316465375n);
+%OptimizeFunctionOnNextCall(foo);
+foo(0, 0, 2316465375n);
+
+%PrepareFunctionForOptimization(bar);
+bar();
+%OptimizeFunctionOnNextCall(bar);
+bar();