fixes the test for SI-7112

Freshly released Java 1.6.0_41 for OSX fails with "IllegalAccessError:
tried to access class JavaSimpleEnumeration_1 from class sun.proxy.$Proxy6",
and rightfully so, because that class isn't public.

I think I will avoid the usual "how could this even work before" in this
commit message.
Merge pull request #2159 from scalamacros/topic/7112-followup-210x

fixes the test for SI-7112
SI-7074 Fix xml attribute sorting

Sorting the attributes of an xml element could drop some of the
attributes. It was caused by the incorrect use of MetaData#copy() to
concatenate "smaller" with the rest of the attributes. The
MetaData#copy() method is similar to the following hypothetical method
on a List:

def copy(other: List): List = head :: other

The fix prepends all elements of "smaller" to the rest of the attributes
in the proper order.
Merge pull request #2149 from khernyo/issue/7074

SI-7074 Fix xml attribute sorting