diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
--- a/llvm/include/llvm/Transforms/IPO/Attributor.h
+++ b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -142,7 +142,9 @@
 };
 
 ChangeStatus operator|(ChangeStatus l, ChangeStatus r);
+void operator|=(ChangeStatus &l, ChangeStatus r);
 ChangeStatus operator&(ChangeStatus l, ChangeStatus r);
+void operator&=(ChangeStatus &l, ChangeStatus r);
 
 enum class DepClassTy {
   REQUIRED,
diff --git a/llvm/lib/Transforms/IPO/Attributor.cpp b/llvm/lib/Transforms/IPO/Attributor.cpp
--- a/llvm/lib/Transforms/IPO/Attributor.cpp
+++ b/llvm/lib/Transforms/IPO/Attributor.cpp
@@ -135,9 +135,15 @@
 ChangeStatus llvm::operator|(ChangeStatus l, ChangeStatus r) {
   return l == ChangeStatus::CHANGED ? l : r;
 }
+
+void llvm::operator|=(ChangeStatus &l, ChangeStatus r) { l = l | r; }
+
 ChangeStatus llvm::operator&(ChangeStatus l, ChangeStatus r) {
   return l == ChangeStatus::UNCHANGED ? l : r;
 }
+
+void llvm::operator&=(ChangeStatus &l, ChangeStatus r) { l = l & r; }
+
 ///}
 
 /// Return true if \p New is equal or worse than \p Old.