Fix CSA_CHECK failure on BE

The load for external reference should be a full pointer load
instead of tagged size.

Change-Id: I3460a26abea5053ba6daa5c6ed908cb93431654a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3842348Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82625}

src/builtins/builtins-regexp-gen.cc

@@ -732,7 +732,9 @@ TNode<HeapObject> RegExpBuiltinsAssembler::RegExpExecInternal(
     TNode<ExternalReference> pending_exception_address =
         ExternalConstant(ExternalReference::Create(
             IsolateAddressId::kPendingExceptionAddress, isolate()));
-    CSA_DCHECK(this, IsTheHole(Load<Object>(pending_exception_address)));
+    TNode<Object> pending_exception = ReinterpretCast<Object>(
+        Load(MachineType::Pointer(), pending_exception_address));
+    CSA_DCHECK(this, IsTheHole(pending_exception));
 #endif  // DEBUG
     CallRuntime(Runtime::kThrowStackOverflow, context);
     Unreachable();