Index: include/llvm/IR/Metadata.h
===================================================================
--- include/llvm/IR/Metadata.h
+++ include/llvm/IR/Metadata.h
@@ -1277,6 +1277,8 @@
     if (!Use)
       return;
     *Use = MD;
+    if(*Use)
+      MetadataTracking::track(*Use);
     Use = nullptr;
   }
 };
Index: test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.a.ll
===================================================================
--- test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.a.ll
+++ test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.a.ll
@@ -0,0 +1,9 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @tinkywinky() {
+  tail call void @patatino()
+  ret void
+}
+
+declare void @patatino()
Index: test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.b.ll
===================================================================
--- test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.b.ll
+++ test/ThinLTO/X86/Inputs/lazy-load-temporaries-cleanup.b.ll
@@ -0,0 +1,23 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void  @patatino() {
+  ret void
+}
+
+!named = !{!0, !2, !4, !6, !8, !10, !12}
+
+!0  =  distinct !{!1}
+!1  = !{i8 1}
+!2  =  distinct !{!3}
+!3  = !{i8 2}
+!4  =  distinct !{!5}
+!5  = !{i8 3}
+!6  =  distinct !{!7}
+!7  = !{i8 4,  i8 5}
+!8  =  distinct !{!9}
+!9  = !{i8 6,  i8 7}
+!10 =  distinct !{!11}
+!11 = !{i8 8,  i8 9}
+!12 =  distinct !{!13, i8 0}
+!13 = !{i8 10, i8 11}
Index: test/ThinLTO/X86/lazy-load-temporaries-cleanup.ll
===================================================================
--- test/ThinLTO/X86/lazy-load-temporaries-cleanup.ll
+++ test/ThinLTO/X86/lazy-load-temporaries-cleanup.ll
@@ -0,0 +1,5 @@
+; This test ensures that metadata temporaries are properly tracked, then cleaned up
+
+; RUN: opt -module-summary %S/Inputs/lazy-load-temporaries-cleanup.a.ll -o %t.1.o
+; RUN: opt -module-summary %S/Inputs/lazy-load-temporaries-cleanup.b.ll -o %t.2.o
+; RUN: ld.lld %t.1.o %t.2.o