Refactor and clean up the msa transform related code layout. Change-Id: Ic5048bd3d62a6046589817da745370ea89448e44
This commit factors out common macro definitions from the forward and inverse transform implementations into vpx_dsp. It removes the duplicate macro definitions from encoder and decoder folders. Change-Id: I92301acbd3317075e9c5f03328a25abb123bca78