C++11: Make expression-list expand to initializer-list.

This will fix a couple more places where brace-init-lists and
pack expansions are allowed but are not currently accepted by
the parser. For example:

foo(abc...);

now parses correctly.

Change-Id: I93710cef35154fea8437329f3174e4a2d56637b8
Reviewed-by: hjk <qthjk@ovi.com>

tests/auto/cplusplus/cxx11/data/packExpansion.1.cpp

@@ -0,0 +1,4 @@
+template <class ... Args>
+int foo(Args args...) {
+    bar(args..., {args...}, e, f);
+}

tests/auto/cplusplus/cxx11/tst_cxx11.cpp

@@ -145,6 +145,7 @@ void tst_cxx11::parse_data()
     QTest::newRow("aliasDecl.1") << "aliasDecl.1.cpp" << "";
     QTest::newRow("enums.1") << "enums.1.cpp" << "";
     QTest::newRow("templateGreaterGreater.1") << "templateGreaterGreater.1.cpp" << "";
+    QTest::newRow("packExpansion.1") << "packExpansion.1.cpp" << "";
 }
 
 void tst_cxx11::parse()