Change-Id: Ic4ffd861608e67fe59bcb3a86010ce3ef11a5519
This matches bitdepth_conversion_sse2.asm and produces substantially better assembly. The old way had lots of 'movzwl' and 'shl' and storing back to memory before loading into an xmm register. Change-Id: Ib33e35354dfd691a4f8b1e39f4dbcbb14cd5302b
Create new helper files specifically for converting tran_low_t types. Change-Id: I7c4c458ef910f3b3d10a3cfbf9df4de7682fd905