Incorrect ScInstr attribute for IMULH_R & ISMULH_R
Mithril sets group_par_is_source to true for IMULH_R & ISMULH_R and does not set can_reuses to true

https://github.com/Ragnaroek/mithril/blob/104ee0fc9cba19586f8d0902ff396f9665cc1471/src/randomx/superscalar.rs#L303-L323

This is different to the reference implementation:

https://github.com/tevador/RandomX/blob/1c603a23fa0004615b4f2d42ad95f2693f16093b/src/superscalar.cpp#L465-L480


