B3 should turn LessThan(Shr(@x, @const1), @const2) into LessThan(@x, @const2 << @const1) whenever possible 
https://bugs.webkit.org/show_bug.cgi?id=152163
Summary B3 should turn LessThan(Shr(@x, @const1), @const2) into LessThan(@x, @const2 ...
Filip Pizlo
Reported 2015-12-10 18:57:30 PST
This will help simplify array bounds checks in asm.js code.
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