[CombToAIG] Add a pattern for mul #8015
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This commit adds a pattern to lower mul. Mul is lowered into chains of
comb.add + comb.mux
```
a_{n}a_{n-1}...a_0 * b
= sum_{i=0}^{n} a_i * 2^i * b
= sum_{i=0}^{n} (a_i ? b : 0) << i
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This commit adds a pattern to lower mul. Mul is lowered into chains of comb.add + comb.mux. There must be more efficient implementation but for now this naive pattern should work fine. LEC is verified.