[libre-riscv-dev] daily kan-ban update 06may2020

[Michael Nolan]

Working on branches in the power_pseudo simulator. I now have branch and 
link working, move to spr, and branch to lr and ctr working. I did run 
into an issue here though, in that the generated python is slightly 
broken in a way I'm not entirely sure I can fix inside the code 
generator. I added a way to automatically patch the generated python 
files to work around this.

The issue is in the following line:

         ctr_ok = BO[2] | (CTR[M:64] != 0) ^ BO[3]

It xors the result of comparing CTR to 0 (which is a bool) with BO[3] 
(Which is a selectableInt)
I'm not sure how to fix this aside from having the code generator 
surround every comparison expression with SelectableInt(x, bits=1)

--Michael