[CUDA] Fix order of vectorized ldg intrinsics' elements.
[CUDA] Fix order of vectorized ldg intrinsics' elements.

Summary: The order is [x, y, z, w], not [w, x, y, z].

Subscribers: cfe-commits, tra

Differential Revision: http://reviews.llvm.org/D20794

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@271215 91177308-0d34-0410-b5e6-96231b3b80d8

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