[X86] Make combineLoopSADPattern use CONCAT_VECTORS instead of INSERT_SUBVECTORS for widening with zeros.
[X86] Make combineLoopSADPattern use CONCAT_VECTORS instead of INSERT_SUBVECTORS for widening with zeros.

CONCAT_VECTORS is more canonical for the early DAG combine runs
until we start getting into the op legalization phases.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@369734 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm