[clang] [clang] Rework `hasBooleanRepresentation`. (PR #136038)

[Timm Baeder via cfe-commits]

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@@ -8623,6 +8624,13 @@ inline bool Type::isIntegralOrEnumerationType() const {
 inline bool Type::isBooleanType() const {
   if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
     return BT->getKind() == BuiltinType::Bool;
+  if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
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tbaederr wrote:

```suggestion
  if (const auto *ET = dyn_cast<EnumType>(CanonicalType)) {
```

https://github.com/llvm/llvm-project/pull/136038