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
@@ -177,7 +177,9 @@
 };
 
 ChangeStatus operator|(ChangeStatus l, ChangeStatus r);
+ChangeStatus &operator|=(ChangeStatus &l, ChangeStatus r);
 ChangeStatus operator&(ChangeStatus l, ChangeStatus r);
+ChangeStatus &operator&=(ChangeStatus &l, ChangeStatus r);
 
 enum class DepClassTy {
   REQUIRED, ///< The target cannot be valid if the source is not.
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
@@ -161,9 +161,17 @@
 ChangeStatus llvm::operator|(ChangeStatus L, ChangeStatus R) {
   return L == ChangeStatus::CHANGED ? L : R;
 }
+ChangeStatus &llvm::operator|=(ChangeStatus &L, ChangeStatus R) {
+  L = L | R;
+  return L;
+}
 ChangeStatus llvm::operator&(ChangeStatus L, ChangeStatus R) {
   return L == ChangeStatus::UNCHANGED ? L : R;
 }
+ChangeStatus &llvm::operator&=(ChangeStatus &L, ChangeStatus R) {
+  L = L & R;
+  return L;
+}
 ///}
 
 bool AA::isValidInScope(const Value &V, const Function *Scope) {
diff --git a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
--- a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
+++ b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
@@ -3505,7 +3505,7 @@
 
     switch (RFKind) {
     case OMPRTL___kmpc_is_spmd_exec_mode:
-      Changed = Changed | foldIsSPMDExecMode(A);
+      Changed |= foldIsSPMDExecMode(A);
       break;
     default:
       llvm_unreachable("Unhandled OpenMP runtime function!");