[llvm] [IR] Check parameters of target extension types on construction (PR #107268)

[Jay Foad via llvm-commits]

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@@ -2679,7 +2679,11 @@ Error BitcodeReader::parseTypeTableBody() {
           return error("Integer parameter too large");
         IntParams.push_back(Record[i]);
       }
-      ResultTy = TargetExtType::get(Context, TypeName, TypeParams, IntParams);
+      auto TTy =
+          TargetExtType::getOrError(Context, TypeName, TypeParams, IntParams);
+      if (auto E = TTy.takeError())
+        return error(toString(std::move(E)));
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jayfoad wrote:

This is a bit of a faff - it unwraps the `Error` and then wraps it again, just to change the error code to `CorruptedBitcode`.

https://github.com/llvm/llvm-project/pull/107268