[modules] Turn JSModule into Module.

src/ast/ast-types.cc

Index: src/ast/ast-types.cc
diff --git a/src/ast/ast-types.cc b/src/ast/ast-types.cc
index aa861af035c3ce8521430ba07a7b60aabc4237b4..556776c8cc3a43efc8157781e58d9fadad66b9aa 100644
--- a/src/ast/ast-types.cc
+++ b/src/ast/ast-types.cc
@@ -208,7 +208,6 @@ AstType::bitset AstBitsetType::Lub(i::Map* map) {
     case JS_DATE_TYPE:
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
     case JS_GENERATOR_OBJECT_TYPE:
-    case JS_MODULE_TYPE:
     case JS_ARRAY_BUFFER_TYPE:
     case JS_ARRAY_TYPE:
     case JS_REGEXP_TYPE:  // TODO(rossberg): there should be a RegExp type.
@@ -244,6 +243,7 @@ AstType::bitset AstBitsetType::Lub(i::Map* map) {
     case SCRIPT_TYPE:
     case CODE_TYPE:
     case PROPERTY_CELL_TYPE:
+    case MODULE_TYPE:
       return kOtherInternal & kTaggedPointer;
 
     // Remaining instance types are unsupported for now. If any of them do