[clang] [WIP] Implement `print-deserialized-declarations` flag to dump source… (PR #133910)

[Ilya Biryukov via cfe-commits]

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@@ -139,16 +283,17 @@ FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
     return nullptr;
 
   // If there are no registered plugins we don't need to wrap the consumer
-  if (FrontendPluginRegistry::begin() == FrontendPluginRegistry::end())
-    return Consumer;
+  if (FrontendPluginRegistry::begin() == FrontendPluginRegistry::end()) {
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ilya-biryukov wrote:

`if (!Consumers.empty())` seems more appropriate here. One way to look at this option is that we add an "implicit" plugin.

https://github.com/llvm/llvm-project/pull/133910