Index: llvm/include/llvm/Transforms/IPO/Attributor.h
===================================================================
--- llvm/include/llvm/Transforms/IPO/Attributor.h
+++ llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -986,7 +986,7 @@
     auto &AA = AAType::createForPosition(IRP, *this);
 
     // If we are currenty seeding attributes, enforce seeding rules.
-    if (SeedingPeriod && !shouldSeedAttribute(AA)) {
+    if (Phase == SEEDING && !shouldSeedAttribute(AA)) {
       AA.getState().indicatePessimisticFixpoint();
       return AA;
     }
@@ -1022,12 +1022,12 @@
 
     // Allow seeded attributes to declare dependencies.
     // Remember the seeding state.
-    bool OldSeedingPeriod = SeedingPeriod;
-    SeedingPeriod = false;
+    AttributorPhase OldPhase = Phase;
+    Phase = UPDATE;
 
     updateAA(AA);
 
-    SeedingPeriod = OldSeedingPeriod;
+    Phase = OldPhase;
 
     if (TrackDependence && AA.getState().isValidState())
       recordDependence(AA, const_cast<AbstractAttribute &>(*QueryingAA),
@@ -1522,9 +1522,15 @@
   /// Invoke instructions with at least a single dead successor block.
   SmallVector<WeakVH, 16> InvokeWithDeadSuccessor;
 
-  /// Wheather attributes are being `seeded`, always false after ::run function
-  /// gets called \see getOrCreateAAFor.
-  bool SeedingPeriod = true;
+  /// A flag that indicates which stage of the process we are in. Initially, the
+  /// phase is SEEDING. UPDATE, MANIFEST and CLEANUP correspond to
+  /// ::runTillFixpoint, ::manifestAttributes and ::cleanupIR, respectively.
+  enum AttributorPhase {
+    SEEDING,
+    UPDATE,
+    MANIFEST,
+    CLEANUP,
+  } Phase = SEEDING;
 
   /// Functions, blocks, and instructions we delete after manifest is done.
   ///
Index: llvm/lib/Transforms/IPO/Attributor.cpp
===================================================================
--- llvm/lib/Transforms/IPO/Attributor.cpp
+++ llvm/lib/Transforms/IPO/Attributor.cpp
@@ -949,6 +949,7 @@
 }
 
 void Attributor::runTillFixpoint() {
+  Phase = UPDATE;
   TimeTraceScope TimeScope("Attributor::runTillFixpoint");
   LLVM_DEBUG(dbgs() << "[Attributor] Identified and initialized "
                     << DG.SyntheticRoot.Deps.size()
@@ -1086,6 +1087,7 @@
 }
 
 ChangeStatus Attributor::manifestAttributes() {
+  Phase = MANIFEST;
   TimeTraceScope TimeScope("Attributor::manifestAttributes");
   size_t NumFinalAAs = DG.SyntheticRoot.Deps.size();
 
@@ -1149,6 +1151,7 @@
 }
 
 ChangeStatus Attributor::cleanupIR() {
+  Phase = CLEANUP;
   TimeTraceScope TimeScope("Attributor::cleanupIR");
   // Delete stuff at the end to avoid invalid references and a nice order.
   LLVM_DEBUG(dbgs() << "\n[Attributor] Delete at least "
@@ -1320,7 +1323,6 @@
 ChangeStatus Attributor::run() {
   TimeTraceScope TimeScope("Attributor::run");
 
-  SeedingPeriod = false;
   runTillFixpoint();
 
   // dump graphs on demand