B3 should reduce CheckMul(x, -1) to CheckSub(0, x) 
https://bugs.webkit.org/show_bug.cgi?id=196368
Summary B3 should reduce CheckMul(x, -1) to CheckSub(0, x)
Robin Morisset
Reported 2019-03-28 12:35:53 PDT
Would require some convertToSub function, similar to the current convertToAdd
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