[not for landing] Debugging gpu failures

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 621f33547e80736b59fdb7d928a3c16ad1ed5fba..8a9672a3dfb229d66ce63714049e92aceb735339 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -330,7 +330,13 @@ RUNTIME_FUNCTION(Runtime_AllocateInTargetSpace) {
   CHECK(size <= kMaxRegularHeapObjectSize);
   bool double_align = AllocateDoubleAlignFlag::decode(flags);
   AllocationSpace space = AllocateTargetSpace::decode(flags);
-  return *isolate->factory()->NewFillerObject(size, double_align, space);
+  HeapObject* result =
+      *isolate->factory()->NewFillerObject(size, double_align, space);
+  if (space == OLD_SPACE) {
+    DCHECK(*(isolate->heap()->OldSpaceAllocationLimitAddress()) != nullptr);
+    DCHECK(*(isolate->heap()->OldSpaceAllocationTopAddress()) != nullptr);
+  }
+  return result;
 }
 
 RUNTIME_FUNCTION(Runtime_AllocateSeqOneByteString) {