[Patch 4/6] ARM attributes: defaultless attributes

[Andrew Stubbs]

The attached patch adds a new flag for the attribute type. This flag
indicates that the attribute does not have a default value.

What this means is that, when the tools write the attributes to the
output, they will not suppress the attribute if it has a zero value.
Since attributes only have a type (and therefore a no-default flag) if
they have been read from somewhere, they are still only written if they
are present.

The only attribute that needs this feature is Tag_nodefaults that is
considered set if it exists, and the value is ignored. (Note that that
"no defaults" in its name is a coincidence, and the important thing here
is that the value can be (should be) zero.)

OK?

Andrew

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