Use preferred 64-bit alignment for i64 & f64 for Thumb targets.  Radar 9695134.
Use preferred 64-bit alignment for i64 & f64 for Thumb targets.  Radar 9695134.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@134070 91177308-0d34-0410-b5e6-96231b3b80d8

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