Check for progress from Span::FreelistPopBatch.

PiperOrigin-RevId: 821921129
Change-Id: Ib1f616aae24cd9713b7251c9c7e39ea00062fded

Author: ckennelly

tcmalloc/central_freelist.h

@@ -545,7 +545,8 @@ inline int CentralFreeList<Forwarder>::RemoveRange(absl::Span<void*> batch) {
     const uint8_t prev_bitwidth = absl::bit_width(prev_allocated);
     const uint8_t prev_index = span->nonempty_index();
     int here = span->FreelistPopBatch(batch.subspan(result), object_size);
-    TC_ASSERT_GT(here, 0);
+    // TODO(b/451807659): Return this to an assert after debugging is done.
+    TC_CHECK_GT(here, 0, "Failed to make progress.  Freelist corrupted?");
     // As the objects are being popped from the span, its utilization might
     // change. So, we remove the stale utilization from the histogram here and
     // add it again once we pop the objects.