Fix a few problems caught by compiler warnings:
* Some of the asr & lsr insns were setting up the c state flag,
but then forgetting to set it in the PSW. Add it like the other
asr & lsr variants.
* Some of the dmulh insns were multiplying one of the source regs
against itself instead of against the other source reg.
* The sat16_cmp parallel insn was using the wrong register in the
compare -- the reg1 src/dst pair are used in the sat16 op, and
the reg2 src/dst pair are used in the add op.
81a3befa0a