Use a signed vector type for the shift amount operand of unsigned shifts. Neon shifts allow a mix of positive and negative shift amounts to shift left or right, respectively, so the shift amount vector should always be signed.  PR8482 (Radar 8603521).
Use a signed vector type for the shift amount operand of unsigned shifts.
Neon shifts allow a mix of positive and negative shift amounts to shift
left or right, respectively, so the shift amount vector should always be
signed.  PR8482 (Radar 8603521).

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@119748 91177308-0d34-0410-b5e6-96231b3b80d8

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