message: Remove unused function 'SetMangledCounterparts' (NFC)
  This function is not referenced.
diff: @@ -59,23 +59,6 @@ public:
  return nullptr;
  }
  - bool SetMangledCounterparts(const char *key_ccstr, const char *value_ccstr) {
  - if (key_ccstr != nullptr && value_ccstr != nullptr) {
  - {
  - const uint8_t h = hash(llvm::StringRef(key_ccstr));
  - llvm::sys::SmartScopedWriter<false> wlock(m_string_pools[h].m_mutex);
  - GetStringMapEntryFromKeyData(key_ccstr).setValue(value_ccstr);
  - }
  - {
  - const uint8_t h = hash(llvm::StringRef(value_ccstr));
  - llvm::sys::SmartScopedWriter<false> wlock(m_string_pools[h].m_mutex);
  - GetStringMapEntryFromKeyData(value_ccstr).setValue(key_ccstr);
  - }
  - return true;
  - }
  - return false;
  - }
  -
  const char *GetConstCString(const char *cstr) {
  if (cstr != nullptr)
  return GetConstCStringWithLength(cstr, strlen(cstr));
  