[ThinLTO/gold] Pass import lists by reference (NFC)

In my earlier patch r271690 I missed passing a map by reference in one
place.

llvm-svn: 271732

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
index bdacf0d209f..9144e2bbc45 100644
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -1199,7 +1199,7 @@ static void
 thinLTOBackends(raw_fd_ostream *ApiFile,
                 const ModuleSummaryIndex &CombinedIndex,
                 StringMap<MemoryBufferRef> &ModuleMap,
-                StringMap<FunctionImporter::ImportMapTy> ImportLists) {
+                StringMap<FunctionImporter::ImportMapTy> &ImportLists) {
   unsigned TaskCount = 0;
   std::vector<ThinLTOTaskInfo> Tasks;
   Tasks.reserve(Modules.size());