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

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 70bf311ee117e993c665e8f029c321b65423cf0b..a9b51dc2aab9a9bf142640865c6d220cc23f0a27 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -30,7 +30,7 @@ Interpreter::Interpreter(Isolate* isolate) : isolate_(isolate) {
 void Interpreter::Initialize() {
   DCHECK(FLAG_ignition);
   if (IsDispatchTableInitialized()) return;
-  Zone zone;
+  Zone zone(isolate_->allocator());
   HandleScope scope(isolate_);
 
   // Generate bytecode handlers for all bytecodes and scales.