[wasm][asm.js] Store foreign init function for asm.js as internal field.

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index 74fa1bf93031e2ab31088ca0b8696f36078a04b8..9e150f66e63542b5f338c8d93b09f03e4060a90c 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -16,6 +16,8 @@
 #include "src/snapshot/snapshot.h"
 #include "src/v8.h"
 
+#include "src/asmjs/asm-wasm-builder.h"
+
 #include "src/wasm/function-body-decoder.h"
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/wasm-js.h"
@@ -677,7 +679,8 @@ static void InstanceFinalizer(const v8::WeakCallbackInfo<void>& data) {
         ResetCompiledModule(isolate, owner, compiled_module);
       } else {
         DCHECK(next->value()->IsFixedArray());
-        wasm_module->SetInternalField(0, next->value());
+        wasm_module->SetInternalField(WasmModuleObject::kCompiledModule,
+                                      next->value());
         DCHECK_NULL(prev);
         WasmCompiledModule::cast(next->value())->reset_weak_prev_instance();
       }
@@ -1423,7 +1426,8 @@ class WasmInstanceBuilder {
           compiled_module_->set_weak_wasm_module(
               original.ToHandleChecked()->weak_wasm_module());
         }
-        module_object_->SetInternalField(0, *compiled_module_);
+        module_object_->SetInternalField(WasmModuleObject::kCompiledModule,
+                                         *compiled_module_);
         compiled_module_->set_weak_owning_instance(link_to_owning_instance);
         GlobalHandles::MakeWeak(global_handle.location(),
                                 global_handle.location(), &InstanceFinalizer,
@@ -1967,6 +1971,16 @@ class WasmInstanceBuilder {
           continue;
         }
       }
+      // Put special asm.js functions on internal fields.
+      if (module_->origin == kAsmJsOrigin) {
+        Handle<String> foreign_init(isolate_->factory()->InternalizeUtf8String(
+            AsmWasmBuilder::foreign_init_name));
+        if (String::Equals(foreign_init, name)) {
+          module_object_->SetInternalField(WasmModuleObject::kAsmForeignInit,
+                                           *desc.value());
+          continue;
+        }
+      }
       v8::Maybe<bool> status = JSReceiver::DefineOwnProperty(
           isolate_, exports_object, name, &desc, Object::THROW_ON_ERROR);
       if (!status.IsJust()) {