Replace ToAsciiVector and ToUC16Vector with single function that returns a tagged value.

src/handles.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 599 matching lines @@
                                      bool with_last_line) {
   src = FlattenGetString(src);
   // Rough estimate of line count based on a roughly estimated average
   // length of (unpacked) code.
   int line_count_estimate = src->length() >> 4;
   List<int> line_ends(line_count_estimate);
   Isolate* isolate = src->GetIsolate();
   {
     AssertNoAllocation no_heap_allocation;  // ensure vectors stay valid.
     // Dispatch on type of strings.
-    if (src->IsAsciiRepresentation()) {
+    String::FlatContent content = src->GetFlatContent(no_heap_allocation);
+    ASSERT(content.IsFlat());
+    if (content.IsAscii()) {
       CalculateLineEnds(isolate,
                         &line_ends,
-                        src->ToAsciiVector(),
+                        content.ToAsciiVector(),
                         with_last_line);
     } else {
       CalculateLineEnds(isolate,
                         &line_ends,
-                        src->ToUC16Vector(),
+                        content.ToUC16Vector(),
                         with_last_line);
     }
   }
   int line_count = line_ends.length();
   Handle<FixedArray> array = isolate->factory()->NewFixedArray(line_count);
   for (int i = 0; i < line_count; i++) {
     array->set(i, Smi::FromInt(line_ends[i]));
   }
   return array;
 }
@@ skipping 311 matching lines @@
 
 bool CompileOptimized(Handle<JSFunction> function,
                       int osr_ast_id,
                       ClearExceptionFlag flag) {
   CompilationInfo info(function);
   info.SetOptimizing(osr_ast_id);
   return CompileLazyHelper(&info, flag);
 }
 
 } }  // namespace v8::internal