Make all ExternalStrings bail out JIT code when accessing the sting contents

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index a7c3d7610c42ad192c2396cba4dedea79370ec67..07f180e3e0859e5ad8cfaffbc98b60aa50a4b472 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1181,7 +1181,7 @@ bool String::MakeExternal(v8::String::ExternalStringResource* resource) {
   // the field caching the address of the backing store.  When we encounter
   // short external strings in generated code, we need to bailout to runtime.
   Map* new_map;
-  if (size < ExternalString::kSize) {
+  if (true) {
     new_map = is_internalized
         ? (is_one_byte
            ? heap->short_external_internalized_string_with_one_byte_data_map()
@@ -1247,7 +1247,7 @@ bool String::MakeExternal(v8::String::ExternalOneByteStringResource* resource) {
   // the field caching the address of the backing store.  When we encounter
   // short external strings in generated code, we need to bailout to runtime.
   Map* new_map;
-  if (size < ExternalString::kSize) {
+  if (true) {
     new_map = is_internalized
                   ? heap->short_external_one_byte_internalized_string_map()
                   : heap->short_external_one_byte_string_map();