String:WriteUtf8: Add REPLACE_INVALID_UTF8 option

src/log.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 102 matching lines @@
     int uc16_length = Min(str->length(), kUtf16BufferSize);
     String::WriteToFlat(str, utf16_buffer, 0, uc16_length);
     int previous = unibrow::Utf16::kNoPreviousCharacter;
     for (int i = 0; i < uc16_length && utf8_pos_ < kUtf8BufferSize; ++i) {
       uc16 c = utf16_buffer[i];
       if (c <= unibrow::Utf8::kMaxOneByteChar) {
         utf8_buffer_[utf8_pos_++] = static_cast<char>(c);
       } else {
         int char_length = unibrow::Utf8::Length(c, previous);
         if (utf8_pos_ + char_length > kUtf8BufferSize) break;
+        // @TODO Fix this Utf8::Encode call site somehow.
         unibrow::Utf8::Encode(utf8_buffer_ + utf8_pos_, c, previous);
         utf8_pos_ += char_length;
       }
       previous = c;
     }
   }
 
   void AppendBytes(const char* bytes, int size) {
     size = Min(size, kUtf8BufferSize - utf8_pos_);
     OS::MemCopy(utf8_buffer_ + utf8_pos_, bytes, size);
@@ skipping 2029 matching lines @@
   if (jit_logger_) {
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 } }  // namespace v8::internal