PVS-Studio warning V629 for Clang

Init *IntRecTy::convertValue(BitsInit *BI) {
  int64_t Result = 0;
  for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i)
    if (....) {
      Result |= Bit->getValue() << i;
    } else {
      return 0;
    }
  return IntInit::get(Result);
}

This suspicious code was found in Clang project by PVS-Studio static code analyzer.
Warning message is:
V629 Consider inspecting the 'Bit->getValue() << i' expression. Bit shifting of the 32-bit value with a subsequent expansion to the 64-bit type. record.cpp 248

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