iteration on ls007 is needed from feedback corrections and questions
https://git.libre-soc.org/?p=libreriscv.git;a=commitdiff;h=3be6402d9b0027e7764fdce59eb84c05874e2a4b https://git.libre-soc.org/?p=libreriscv.git;a=commitdiff;h=c942c310e7d09b5ee6c15356d53bb22c4ceab8ec mention macro-op fusion opportunity only if copy precedes the tern/bin instruction.
bug #1034 - a couple more instructions were added on CR *bits* not just CR *fields* after it was noted in bug #676 (maxloc) that targetted bit-wise operations on different elements in fields (CR5.SO <- CR0.EQ...) were needed.