[ORC] Don't unnecessarily copy collection element.

diff --git a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
index 7389d1e..ecdf773 100644 (file)
--- a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
@@ -412,7 +412,7 @@ void SharedMemoryMapper::release(ArrayRef<ExecutorAddr> Bases,
 }
 
 SharedMemoryMapper::~SharedMemoryMapper() {
-  for (const auto R : Reservations) {
+  for (const auto &R : Reservations) {
 
 #if defined(LLVM_ON_UNIX) && !defined(__ANDROID__)