Polar encoder performance degradation
After !2131 (merged) there is a significant increase in polar encoding time of about 100x.
The attached patch can be used to measure this and the following are the encoding time measured on my testbench.
Before the merge PDCCH encoding: 1.051 us; 2247; 2.848 us
After the merger PDCCH encoding: 130.489 us; 2205; 236.611 us;