Expose a lower bound of malloc'd memory via heap statistics

test/cctest/compiler/test-loop-analysis.cc

Index: test/cctest/compiler/test-loop-analysis.cc
diff --git a/test/cctest/compiler/test-loop-analysis.cc b/test/cctest/compiler/test-loop-analysis.cc
index 68bfc2858ff430aff96d553a2056f755eb8a1594..fb61e20197926f849e6f463d1cbe541a950eb658 100644
--- a/test/cctest/compiler/test-loop-analysis.cc
+++ b/test/cctest/compiler/test-loop-analysis.cc
@@ -127,7 +127,7 @@ class LoopFinderTester : HandleAndZoneScope {
         OFStream os(stdout);
         os << AsRPO(graph);
       }
-      Zone zone;
+      Zone zone(main_isolate()->allocator());
       loop_tree = LoopFinder::BuildLoopTree(&graph, &zone);
     }
     return loop_tree;