diff --git a/llvm/lib/Transforms/IPO/SampleProfile.cpp b/llvm/lib/Transforms/IPO/SampleProfile.cpp
--- a/llvm/lib/Transforms/IPO/SampleProfile.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfile.cpp
@@ -2014,6 +2014,8 @@
     if (Reader->profileIsPreInlined()) {
       if (!UsePreInlinerDecision.getNumOccurrences())
         UsePreInlinerDecision = true;
+      if (!OverwriteExistingWeights.getNumOccurrences())
+        OverwriteExistingWeights = true;
     }
 
     if (!Reader->profileIsCS()) {