[clang-tools-extra] [clang-doc] Display enum type along with enum name in HTML view (PR #181347)

[Samrudh Nelli via cfe-commits]

================
@@ -1207,8 +1207,8 @@ emitInfo(const EnumDecl *D, const FullComment *FC, Location Loc,
     return {};
 
   Enum.Scoped = D->isScoped();
-  if (D->isFixed()) {
-    auto Name = D->getIntegerType().getAsString();
+  if (const TypeSourceInfo *Info = D->getIntegerTypeSourceInfo()) {
+    auto Name = Info->getType().getAsString();
     Enum.BaseType = TypeInfo(Name, Name);
----------------
SamrudhNelli wrote:

I had a look inside `AST/TypePrinter.cpp` and the following function is called eventually by `getAsString()`.
```
void QualType::getAsStringInternal(const Type *ty, Qualifiers qs,
                                   std::string &buffer,
                                   const PrintingPolicy &policy) {
  SmallString<256> Buf;
  llvm::raw_svector_ostream StrOS(Buf);
  TypePrinter(policy).print(ty, qs, StrOS, buffer);
  std::string str = std::string(StrOS.str());
  buffer.swap(str);
}
```
Since, this uses `TypePrinter`, I think we do need a string, we can't pass a StringRef, as the temporary string could be out of scope just like you mentioned.
I would love to hear your ideas on implementing the StringRef function, do we need a custom TypePrinter() for that?

https://github.com/llvm/llvm-project/pull/181347