SIMD-accelerated fast integer forward DCT routine for MIPS DSPr2


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1055 632fc199-4ca6-4c93-a231-07263d6284db
SIMD-accelerated fast integer inverse DCT routine for MIPS DSPr2


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1056 632fc199-4ca6-4c93-a231-07263d6284db
adjust DSPr2 performance claims


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1057 632fc199-4ca6-4c93-a231-07263d6284db