Add regression test for cross-thread committed memory growth (#814)

src/snmalloc/backend_helpers/palrange.h

@@ -43,6 +43,7 @@ namespace snmalloc
 #ifdef SNMALLOC_TRACING
         message<1024>("Pal range alloc: {} ({})", result.unsafe_ptr(), size);
 #endif
+        message<1024>("Pal range alloc: {} ({})", result.unsafe_ptr(), size);
 
         return result;
       }

src/test/func/statistics/stats.cc

@@ -63,6 +63,16 @@ void debug_check_empty_2()
       std::cout << "." << std::flush;
     }
     auto r = snmalloc::alloc(size);
+    if (r == nullptr)
+    {
+      std::cout << "Allocation failed at " << i << " allocations of " << size
+                << std::endl;
+      for (size_t j = 0; j < i; j++)
+      {
+        snmalloc::dealloc(allocs[j]);
+      }
+      return;
+    }
     allocs.push_back(r);
     snmalloc::debug_check_empty(&result);
     if (result != false)