Fix test-heap/BootstrapperExports on no-snap builds

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index f0278ca666724daf7faf1f0a10384e2a1e4f9d1e..f2363b1372dae0b34fd3f7029692ff75a049194f 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1923,6 +1923,11 @@ bool Genesis::InstallNatives() {
                                 "container to export to experimental natives");
   native_context()->set_builtin_exports_object(*builtin_exports);
 
+  if (FLAG_expose_natives_as != NULL) {
+    Handle<String> shared_key = factory()->NewStringFromAsciiChecked("shared");
+    JSObject::AddProperty(builtins, shared_key, shared, NONE);
+  }
+
   {  // -- S c r i p t
     // Builtin functions for Script.
     Handle<JSFunction> script_fun = InstallFunction(