C++11: Allow uniform initialization in ctor init lists.

So
class C { C() : _x{12}, _y({12}) {} };
now parses correctly.

Change-Id: I4281dcb0541a86b550e74630cad6ae0a59fef1b4
Reviewed-by: hjk <qthjk@ovi.com>

tests/auto/cplusplus/cxx11/data/braceInitializers.2.cpp

@@ -0,0 +1,4 @@
+class C {
+    C() : _x{12}, _y({12}) {}
+    C(int i) : _x{{{12, 2}, {"foo"}}, {bar}}... {}
+};