Make sure that the template parameter lists get from the parser down to ActOnFunctionDeclarator for function template definitions

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74040 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 7c4cb60..c319f7f 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -3037,6 +3037,8 @@
 }
 
 Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
+  if (!D)
+    return D;
   FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>());
 
   CurFunctionNeedsScopeChecking = false;