[llvm-branch-commits] [llvm] [PassBuilder][CodeGen] Add callback style pass buider (PR #116913)

[Matt Arsenault via llvm-branch-commits]

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@@ -779,6 +966,55 @@ class PassBuilder {
               2>
       PipelineEarlySimplificationEPCallbacks;
 
+  // CodeGen extension point callbacks
+  std::function<Error(ModulePassManager &, raw_pwrite_stream &,
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arsenm wrote:

can this be function_ref? 

https://github.com/llvm/llvm-project/pull/116913