diff --git a/llvm/lib/IR/PassInstrumentation.cpp b/llvm/lib/IR/PassInstrumentation.cpp
index 49cc6ec..d3867de 100644
--- a/llvm/lib/IR/PassInstrumentation.cpp
+++ b/llvm/lib/IR/PassInstrumentation.cpp
@@ -12,10 +12,19 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/IR/PassInstrumentation.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/IR/PassManager.h"
 
 namespace llvm {
 
 AnalysisKey PassInstrumentationAnalysis::Key;
 
+bool isSpecialPass(StringRef PassID, const std::vector<StringRef> &Specials) {
+  size_t Pos = PassID.find('<');
+  if (Pos == StringRef::npos)
+    return false;
+  StringRef Prefix = PassID.substr(0, Pos);
+  return any_of(Specials, [Prefix](StringRef S) { return Prefix.endswith(S); });
+}
+
 } // namespace llvm