Implement proper module linking.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index dd1f710b25224a9521636d12cb221871a39e4f59..3aaff73e247935ab65438c212e204d829df14072 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -530,7 +530,8 @@ class Heap {
   MUST_USE_RESULT MaybeObject* AllocateJSObject(
       JSFunction* constructor, PretenureFlag pretenure = NOT_TENURED);
 
-  MUST_USE_RESULT MaybeObject* AllocateJSModule();
+  MUST_USE_RESULT MaybeObject* AllocateJSModule(Context* context,
+                                                ScopeInfo* scope_info);
 
   // Allocate a JSArray with no elements
   MUST_USE_RESULT MaybeObject* AllocateEmptyJSArray(
@@ -824,8 +825,7 @@ class Heap {
   MUST_USE_RESULT MaybeObject* AllocateGlobalContext();
 
   // Allocate a module context.
-  MUST_USE_RESULT MaybeObject* AllocateModuleContext(Context* previous,
-                                                     ScopeInfo* scope_info);
+  MUST_USE_RESULT MaybeObject* AllocateModuleContext(ScopeInfo* scope_info);
 
   // Allocate a function context.
   MUST_USE_RESULT MaybeObject* AllocateFunctionContext(int length,