================
@@ -233,6 +234,20 @@ bool ExecuteCompilerInvocation(CompilerInstance *Clang) {
 
   Clang->LoadRequestedPlugins();
 
+  // Load and store pass plugins for the back-end. Store the loaded pass 
plugins
+  // here and store references to these in CodeGenOpts to avoid pulling in the
+  // entire PassPlugin dependency chain in CodeGenOpts.
+  std::vector<std::unique_ptr<llvm::PassPlugin>> PassPlugins;
+  for (const std::string &Path : Clang->getCodeGenOpts().PassPluginNames) {
----------------
weliveindetail wrote:

Not a blocker for this PR, but since the question comes up: There is a test 
from https://github.com/llvm/llvm-project/pull/70171 that loads a LLVM plugin 
through a dummy `PluginASTAction`. The additional `PassBuilderCallbacks` member 
in `CodeGenOption` originates from this PR.

@wsmoses Is there a good reason for it not to use the LLVM plugin interface? If 
yes, can we represent that in the test? If no, can we drop it?

https://github.com/llvm/llvm-project/pull/171868
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