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

test/cctest/compiler/function-tester.h

Index: test/cctest/compiler/function-tester.h
diff --git a/test/cctest/compiler/function-tester.h b/test/cctest/compiler/function-tester.h
index c6093ce6e4976c73e7cf8774441a133d2f588d62..631bdde5ceac72435d199dc52c7f84728ed2fb7d 100644
--- a/test/cctest/compiler/function-tester.h
+++ b/test/cctest/compiler/function-tester.h
@@ -175,7 +175,7 @@ class FunctionTester : public InitializedHandleScope {
   uint32_t flags_;
 
   Handle<JSFunction> Compile(Handle<JSFunction> function) {
-    Zone zone;
+    Zone zone(function->GetIsolate()->allocator());
     ParseInfo parse_info(&zone, function);
     CompilationInfo info(&parse_info);
     info.MarkAsDeoptimizationEnabled();
@@ -224,7 +224,7 @@ class FunctionTester : public InitializedHandleScope {
   // Compile the given machine graph instead of the source of the function
   // and replace the JSFunction's code with the result.
   Handle<JSFunction> CompileGraph(Graph* graph) {
-    Zone zone;
+    Zone zone(function->GetIsolate()->allocator());
     ParseInfo parse_info(&zone, function);
     CompilationInfo info(&parse_info);