lib: shimming V8-specific code

In order to work around a V8-specific module we'll inject a cache entry
which stubs out these methods and prevents them from being parsed.

lib/internal/bootstrap_node.js

@@ -27,6 +27,20 @@
     // do this good and early, since it handles errors.
     setupProcessFatal();
 
+    if (process.jsEngine === 'chakracore') {
+      // This file contains the V8-specific "%<function>" syntax for accessing
+      // private functions.  This is not supported on ChakraCore and causes a
+      // parser failure.  Inject a cache entry to prevent the file from being
+      // parsed.
+      NativeModule._cache['internal/v8'] = {
+        loaded: true,
+        exports: {
+          previewMapIterator: function() {},
+          previewSetIterator: function() {},
+        },
+      };
+    }
+
     setupV8();
     setupProcessICUVersions();