diff --git a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
--- a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -215,9 +215,11 @@
   Function *NF = Function::Create(NFTy, F->getLinkage(), F->getAddressSpace(),
                                   F->getName());
   NF->copyAttributesFrom(F);
+  NF->copyMetadata(F, 0);
 
-  // Patch the pointer to LLVM function in debug info descriptor.
-  NF->setSubprogram(F->getSubprogram());
+  // The new function will have the !dbg metadata copied from the original
+  // function. The original function may not be deleted, and dbg metadata need
+  // to be unique so we need to drop it.
   F->setSubprogram(nullptr);
 
   LLVM_DEBUG(dbgs() << "ARG PROMOTION:  Promoting to:" << *NF << "\n"
diff --git a/llvm/test/Transforms/ArgumentPromotion/profile.ll b/llvm/test/Transforms/ArgumentPromotion/profile.ll
--- a/llvm/test/Transforms/ArgumentPromotion/profile.ll
+++ b/llvm/test/Transforms/ArgumentPromotion/profile.ll
@@ -15,9 +15,9 @@
   ret void
 }
 
-define internal void @promote_i32_ptr(i32* %xp) {
+define internal void @promote_i32_ptr(i32* %xp) !prof !1 {
 ; CHECK-LABEL: define {{[^@]+}}@promote_i32_ptr
-; CHECK-SAME: (i32 [[XP_VAL:%.*]])
+; CHECK-SAME: (i32 [[XP_VAL:%.*]]) !prof !1
 ; CHECK-NEXT:    call void @use_i32(i32 [[XP_VAL]])
 ; CHECK-NEXT:    ret void
 ;
@@ -29,3 +29,4 @@
 declare void @use_i32(i32)
 
 !0 = !{!"branch_weights", i32 30}
+!1 = !{!"function_entry_count", i64 100}