Index: lib/Linker/LinkModules.cpp
===================================================================
--- lib/Linker/LinkModules.cpp
+++ lib/Linker/LinkModules.cpp
@@ -1624,15 +1624,6 @@
     linkGlobalValueBody(Src);
   }
 
-  // Remap all of the named MDNodes in Src into the DstM module. We do this
-  // after linking GlobalValues so that MDNodes that reference GlobalValues
-  // are properly remapped.
-  linkNamedMDNodes();
-
-  // Merge the module flags into the DstM module.
-  if (linkModuleFlagsMetadata())
-    return true;
-
   // Update the initializers in the DstM module now that all globals that may
   // be referenced are in DstM.
   for (GlobalVariable &Src : SrcM->globals()) {
@@ -1657,6 +1648,15 @@
       return true;
   }
 
+  // Remap all of the named MDNodes in Src into the DstM module. We do this
+  // after linking GlobalValues so that MDNodes that reference GlobalValues
+  // are properly remapped.
+  linkNamedMDNodes();
+
+  // Merge the module flags into the DstM module.
+  if (linkModuleFlagsMetadata())
+    return true;
+
   return false;
 }
 
Index: test/Linker/Inputs/linkage_debug.b.ll
===================================================================
--- /dev/null
+++ test/Linker/Inputs/linkage_debug.b.ll
@@ -0,0 +1,27 @@
+@X = external global i32 
+
+declare i32 @foo() 
+
+define void @bar() {
+	load i32, i32* @X, !dbg !10
+	call i32 @foo(), !dbg !11
+	ret void, !dbg !12
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!7, !8}
+!llvm.ident = !{!9}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
+!1 = !DIFile(filename: "linkage.b.c", directory: ".")
+!2 = !{}
+!3 = !{!4}
+!4 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !5, isLocal: false, isDefinition: true, scopeLine: 5, isOptimized: true, function: void ()* @bar, variables: !2)
+!5 = !DISubroutineType(types: !6)
+!6 = !{null}
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{!"clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)"}
+!10 = !DILocation(line: 6, column: 7, scope: !4)
+!11 = !DILocation(line: 6, column: 3, scope: !4)
+!12 = !DILocation(line: 7, column: 1, scope: !4)
Index: test/Linker/Inputs/linkage_debug.c.ll
===================================================================
--- /dev/null
+++ test/Linker/Inputs/linkage_debug.c.ll
@@ -0,0 +1,29 @@
+@X = global i32 5
+@U = global i32 6
+define i32 @foo() { ret i32 7, !dbg !20 }
+define i32 @unused() { ret i32 8, !dbg !21 }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!16, !17}
+!llvm.ident = !{!18}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3, globals: !13)
+!1 = !DIFile(filename: "linkage.c.c", directory: ".")
+!2 = !{}
+!3 = !{!4, !10}
+!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, function: i32 ()* @foo, variables: !8)
+!5 = !DISubroutineType(types: !6)
+!6 = !{!7, !7}
+!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!8 = !{}
+!10 = distinct !DISubprogram(name: "unused", scope: !1, file: !1, line: 8, type: !11, isLocal: false, isDefinition: true, scopeLine: 8, isOptimized: true, function: i32 ()* @unused, variables: !2)
+!11 = !DISubroutineType(types: !12)
+!12 = !{!7}
+!13 = !{!14, !15}
+!14 = !DIGlobalVariable(name: "X", scope: !0, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, variable: i32* @X)
+!15 = !DIGlobalVariable(name: "U", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, variable: i32* @U)
+!16 = !{i32 2, !"Dwarf Version", i32 4}
+!17 = !{i32 2, !"Debug Info Version", i32 3}
+!18 = !{!"clang version 3.8.0 (trunk 251407) (llvm/trunk 251401)"}
+!20 = !DILocation(line: 4, column: 13, scope: !4)
+!21 = !DILocation(line: 9, column: 3, scope: !10)
Index: test/Linker/link-flags-debug.ll
===================================================================
--- /dev/null
+++ test/Linker/link-flags-debug.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-as %S/Inputs/linkage_debug.b.ll -o %t.b.bc
+; RUN: llvm-as %S/Inputs/linkage_debug.c.ll -o %t.c.bc
+; RUN: llvm-link -S -only-needed %t.b.bc %t.c.bc | FileCheck %s -check-prefix=B -check-prefix=C -check-prefix=CN
+; RUN: llvm-link -S -internalize -only-needed %t.b.bc %t.c.bc | FileCheck %s -check-prefix=B -check-prefix=CI -check-prefix=CN
+
+C-LABEL: @X = global i32 5
+CI-LABEL: @X = internal global i32 5
+CN-LABEL:@U = external global i32
+
+B-LABEL: define void @bar() {
+
+C-LABEL: define i32 @foo()
+CI-LABEL: define internal i32 @foo()
+
+CN-LABEL:declare i32 @unused()