[llvm] [Pass] Support start/stop in instrumentation (PR #70912)

[via llvm-commits]

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@@ -152,6 +153,11 @@ class PassInstrumentationCallbacks {
   void addClassToPassName(StringRef ClassName, StringRef PassName);
   /// Get the pass name for a given pass class name.
   StringRef getPassNameForClassName(StringRef ClassName);
+  /// Inverse of getPassNameForClassName
+  StringRef getClassNameForPassName(StringRef PassName);
+
+  /// Helper callback to support options like start-before.
+  llvm::unique_function<StartStopFunc> StartStopCallback;
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paperchalice wrote:

Oh, I forgot to remove this, this implementation doesn't need this any more, sorry.

https://github.com/llvm/llvm-project/pull/70912