[clang] [Attributes] Support Attributes being declared as only supporting late parsing when passing an experimental feature flag (PR #88596)

[via cfe-commits]

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@@ -2885,8 +2974,23 @@ static void emitAttributes(RecordKeeper &Records, raw_ostream &OS,
         return;
       }
       OS << "\n  : " << SuperName << "(Ctx, CommonInfo, ";
-      OS << "attr::" << R.getName() << ", "
-         << (R.getValueAsBit("LateParsed") ? "true" : "false");
+      OS << "attr::" << R.getName() << ", ";
+
+      // Handle different late parsing modes.
+      switch (getLateAttrParseKind(&R)) {
+      case LateAttrParseKind::LateAttrParsingNever:
+        OS << '0';
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Sirraide wrote:

```suggestion
        OS << "false";
```

https://github.com/llvm/llvm-project/pull/88596