[v3] type_traits fixes for arm

[Benjamin Kosnik]

... testing on arm-eabi revealed mistaken requirements test cases in
type_traits. In actuality, make_unsigned/make_signed for enum types
doesn't require the type to be int, but rather an integral type of the
same rank as the enum. Fixed thusly.

This cleans up some noise in the arm testsuite, and perhaps others
where sizeof(enum) is not sizeof(int).

gcc
gcc-4_3-branch

-benjamin
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