[CombToAIG] Lower comb.icmp #8016
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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
This commit adds a pattern for icmp. Lowering is straight-forward but fairly complicated. LEC is verified
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This commit adds a pattern for icmp. Lowering is straight-forward but fairly complicated. LEC is verified. Test is modified to run CSE for simplifying lit testing.