RFC: Automatically test IFUNC implementations

[H.J. Lu]

Hi,

http://sourceware.org/bugzilla/show_bug.cgi?id=14602

shows that we need to test all IFUNC implementations as much as we can.
I created hjl/ifunc/test branch to automatically test IFUNC
implementations.  Its goals are

1. Provide an infrastructure to tests all implementations supported
on build machine automatically.
2. No changes to IFUNC selectors.
3. Test the new IFUNC implementation by adding it to the list of
IFUNC functions.

Change IFUNC selector is not the goal of this branch.  Any comments?

Thanks.


H.J.