[RuntimeDyld] Silence a compiler error.

This should fix the error at
http://lab.llvm.org:8011/builders/lld-x86_64-darwin13/builds/19008

llvm-svn: 327478
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index d4016b1..3d274b6 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -1200,7 +1200,7 @@
 
 std::map<StringRef, JITEvaluatedSymbol> RuntimeDyld::getSymbolTable() const {
   if (!Dyld)
-    return {};
+    return std::map<StringRef, JITEvaluatedSymbol>();
   return Dyld->getSymbolTable();
 }