Expose a hint which communicates that string might be written many times.

test/cctest/test-strings.cc

Index: test/cctest/test-strings.cc
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index aadb7d01beab0b9eaf50d091e9b31bb13029cd42..0e30092dbbad90476188044a4821aa3945a8b684 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -347,38 +347,6 @@ TEST(Utf8Conversion) {
 }
 
 
-TEST(StringConcatFlatten) {
-  InitializeVM();
-  v8::HandleScope handle_scope;
-
-  const char* stringA = "0123456789";
-  const char* stringB = "ABCDEFGHIJ";
-
-  v8::Local<v8::String> a = v8::String::New(stringA);
-  v8::Local<v8::String> b = v8::String::New(stringB);
-
-  v8::Local<v8::String> cons = v8::String::Concat(a, b);
-
-  i::Handle<i::String> str = v8::Utils::OpenHandle(*cons);
-  CHECK(!str->IsFlat());
-
-  cons->Flatten();
-
-  CHECK(str->IsFlat());
-
-  char buffer[21];
-  cons->WriteUtf8(buffer);
-
-  for (int i = 0; i < 10; i++) {
-    CHECK_EQ(stringA[i], buffer[i]);
-  }
-
-  for (int i = 0; i < 10; i++) {
-    CHECK_EQ(stringB[i], buffer[i + 10]);
-  }
-}
-
-
 TEST(ExternalShortStringAdd) {
   ZoneScope zone(DELETE_ON_EXIT);