[AArch64] Robustize neon-scalar-copy.ll tests. NFC.
[AArch64] Robustize neon-scalar-copy.ll tests. NFC.

Some of those didn't even have run lines: they were removed
inadvertently during the Great Merge of 2014.

They used to check for DUPs, but now we go through W-regs?
Filed PR22418 for that potential regression.

For now, just make the tests explicit, so we now where we stand.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@227635 91177308-0d34-0410-b5e6-96231b3b80d8

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