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
@@ -1487,6 +1487,12 @@
   /// triggers deletion of trivially dead istructions.
   void deleteAfterManifest(BasicBlock &BB) { ToBeDeletedBlocks.insert(&BB); }
 
+  // Record that \p BB is added during the manifest of an AA. Added basic blocks
+  // are preserved in the IR.
+  void registerManifestAddedBasicBlock(BasicBlock &BB) {
+    ManifestAddedBlocks.insert(&BB);
+  }
+
   /// Record that \p F is deleted after information was manifested.
   void deleteAfterManifest(Function &F) {
     if (DeleteFns)
@@ -1979,6 +1985,7 @@
   ///{
   SmallPtrSet<Function *, 8> ToBeDeletedFunctions;
   SmallPtrSet<BasicBlock *, 8> ToBeDeletedBlocks;
+  SmallPtrSet<BasicBlock *, 8> ManifestAddedBlocks;
   SmallDenseSet<WeakVH, 8> ToBeDeletedInsts;
   ///}
 
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
@@ -801,6 +801,9 @@
   const IRPosition::CallBaseContext *CBCtx =
       QueryingAA ? QueryingAA->getCallBaseContext() : nullptr;
 
+  if (ManifestAddedBlocks.contains(I.getParent()))
+    return false;
+
   if (!FnLivenessAA)
     FnLivenessAA =
         lookupAAFor<AAIsDead>(IRPosition::function(*I.getFunction(), CBCtx),
@@ -1441,7 +1444,9 @@
                     << ToBeDeletedBlocks.size() << " blocks and "
                     << ToBeDeletedInsts.size() << " instructions and "
                     << ToBeChangedValues.size() << " values and "
-                    << ToBeChangedUses.size() << " uses\n");
+                    << ToBeChangedUses.size() << " uses. "
+                    << "Preserve manifest added " << ManifestAddedBlocks.size()
+                    << " blocks\n");
 
   SmallVector<WeakTrackingVH, 32> DeadInsts;
   SmallVector<Instruction *, 32> TerminatorsToFold;
@@ -1602,6 +1607,9 @@
       assert(isRunOn(*BB->getParent()) &&
              "Cannot delete a block outside the current SCC!");
       CGModifiedFunctions.insert(BB->getParent());
+      // Do not delete BBs added during manifests of AAs.
+      if (ManifestAddedBlocks.contains(BB))
+        continue;
       ToBeDeletedBBs.push_back(BB);
     }
     // Actually we do not delete the blocks but squash them into a single