PVS-Studio warning V556 for Clang

enum LegalizeAction {
  Legal,
  Promote,
  Expand,
  Custom
};

enum LegalizeTypeAction {
  TypeLegal,
  TypePromoteInteger,
  TypeExpandInteger,
  TypeSoftenFloat,
  TypeExpandFloat,
  TypeScalarizeVector,
  TypeSplitVector,
  TypeWidenVector
};

LegalizeTypeAction getTypeAction(LLVMContext &Context,
                                 EVT VT) const;

EVT getTypeToExpandTo(LLVMContext &Context, EVT VT) const {
  ...
  switch (getTypeAction(Context, VT)) {
  case Legal:
    return VT;
  case Expand:
  ...
}

It works because the values coincide, but that's strange.

This suspicious code was found in Clang project by PVS-Studio static code analyzer.
Warning message is:
V556 The values of different enum types are compared: switch(ENUM_TYPE_A) { case ENUM_TYPE_B: ... }. LLVMAsmPrinter targetlowering.h 268

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