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MUL+I / MUL+U simplification fixes. #21

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MUL+I / MUL+U simplification fixes. #21

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ksherlock
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  1. fold constants before commuting or checking for shifts
  2. optimize x * 0 => 0
  3. identity check didn't work since constant is in l tree, not in r tree.

@ksherlock
MUL+I / MUL+U simplification fixes.
6a7126e 
1. fold constants before commuting or checking for shifts
2. optimize x * 0 => 0
3. identity check didn't work since constant is in l tree, not in r tree.
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