Fix instruction length for MMA insns.
Prefixed instructions should not have their length explicitly set to '8'. The function get_attr_length() will adjust the length appropriately based on the value of the "prefixed" attribute.
2020-12-16 Pat Haugen <pthaugen@linux.ibm.com>
gcc/
* config/rs6000/mma.md (*movxo, mma_<vvi4i4i8>, mma_<avvi4i4i8>,
mma_<vvi4i4i2>, mma_<avvi4i4i2>, mma_<vvi4i4>, mma_<avvi4i4>,
mma_<pvi4i2>, mma_<apvi4i2>, mma_<vvi4i4i4>, mma_<avvi4i4i4>):
Remove explicit setting of length attribute.