C++11: Allow brace initializer lists in more places.

This allows them to be used in declarator initializers that expect
an expression list in parentheses. Like

T v({1, 2}, 3, 4);

Change-Id: I62e1ffd355ca88f7acbb8708c9b40c8310489ca3
Reviewed-by: hjk <qthjk@ovi.com>

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

@@ -1,9 +1,8 @@
 Type var1 = { 1, 2, 3};
 Type var2{1, 2, 3};
-//Type var3({1, 2, 3});
+Type var3({1, 2, 3});
 
 class C {
   Type var1 = {1, 2, 3};
   Type var2{1, 2, 3};
-  //Type var3({1, 2, 3});
 };