Index: clang/lib/CodeGen/CGDebugInfo.h
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.h
+++ clang/lib/CodeGen/CGDebugInfo.h
@@ -408,10 +408,11 @@
   /// End an inlined function scope.
   void EmitInlineFunctionEnd(CGBuilderTy &Builder);
 
-  /// Emit debug info for a function declaration.
-  /// \p Fn is set only when a declaration for a debug call site gets created.
-  void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
-                        QualType FnType, llvm::Function *Fn = nullptr);
+  /// Emit debug info for a function declaration. Set \p IsDeclForCallSite if
+  /// a call site entry must reference the declaration.
+  llvm::DISubprogram *EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
+                                       QualType FnType,
+                                       bool IsDeclForCallSite = false);
 
   /// Emit debug info for an extern function being called.
   /// This is needed for call site debug info.
Index: clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.cpp
+++ clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3618,18 +3618,19 @@
     RegionMap[D].reset(SP);
 }
 
-void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
-                                   QualType FnType, llvm::Function *Fn) {
+llvm::DISubprogram *CGDebugInfo::EmitFunctionDecl(GlobalDecl GD,
+                                                  SourceLocation Loc,
+                                                  QualType FnType,
+                                                  bool IsDeclForCallSite) {
   StringRef Name;
   StringRef LinkageName;
 
   const Decl *D = GD.getDecl();
   if (!D)
-    return;
+    return nullptr;
 
   llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
   llvm::DIFile *Unit = getOrCreateFile(Loc);
-  bool IsDeclForCallSite = Fn ? true : false;
   llvm::DIScope *FDContext =
       IsDeclForCallSite ? Unit : getDeclContextDescriptor(D);
   llvm::DINodeArray TParamsArray;
@@ -3662,11 +3663,8 @@
       FDContext, Name, LinkageName, Unit, LineNo,
       getOrCreateFunctionType(D, FnType, Unit), ScopeLine, Flags, SPFlags,
       TParamsArray.get(), getFunctionDeclaration(D));
-
-  if (IsDeclForCallSite)
-    Fn->setSubprogram(SP);
-
   DBuilder.retainType(SP);
+  return SP;
 }
 
 void CGDebugInfo::EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke,
@@ -3688,8 +3686,13 @@
   if (Func->getSubprogram())
     return;
 
-  if (!CalleeDecl->isStatic() && !CalleeDecl->isInlined())
-    EmitFunctionDecl(CalleeDecl, CalleeDecl->getLocation(), CalleeType, Func);
+  if (!CalleeDecl->isStatic() && !CalleeDecl->isInlined()) {
+    llvm::DISubprogram *SP =
+        EmitFunctionDecl(CalleeDecl, CalleeDecl->getLocation(), CalleeType,
+                         /*IsDeclForCallSite=*/true);
+    assert(SP && "Could not find decl for callee?");
+    Func->setSubprogram(SP);
+  }
 }
 
 void CGDebugInfo::EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD) {