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

src/wasm/wasm-module.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 #include "src/v8.h"
 
 #include "src/simulator.h"
 
@@ skipping 571 matching lines @@
   // Always make a direct call to whatever is in the table at that location.
   // A wrapper will be generated for FFI calls.
   WasmFunction* function = &module->functions[index];
   return GetWasmCallDescriptor(zone, function->sig);
 }
 
 
 int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,
                                 const byte* module_end, bool asm_js) {
   HandleScope scope(isolate);
-  Zone zone;
+  Zone zone(isolate->allocator());
   // Decode the module, but don't verify function bodies, since we'll
   // be compiling them anyway.
   ModuleResult result = DecodeWasmModule(isolate, &zone, module_start,
                                          module_end, false, kWasmOrigin);
   if (result.failed()) {
     if (result.val) {
       delete result.val;
     }
     // Module verification failed. throw.
     std::ostringstream str;
@@ skipping 86 matching lines @@
   }
   if (result->IsHeapNumber()) {
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower.Error("WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8