Add checker part of test, fix intrinsic copying

Rationale:
I forgot to add the check test part of this test,
and incidentally found an omission: intrinsic
information should be set in the scalar loop
(to get best code there too, not just a lib call).

Test: test-art-host, test-art-target
Change-Id: I94aa4cdf042f72690d10efee3a9dc7c476d5c5e0