Bug 1503326; r=sunfish, r=nbp

--HG--
extra : rebase_source : 8dd830fcaae5442da95cbb00bce94a0cda358fed
extra : amend_source : 9e20e298f0c1e7cf8db28e9d0bcd7672ceeee9c0

js/src/jit/RangeAnalysis.cpp

@@ -2291,7 +2291,7 @@ RangeAnalysis::analyzeLoopPhi(LoopIterationBound* loopBound, MPhi* phi)
         return;
     }
 
-    SimpleLinearSum modified = ExtractLinearSum(phi->getLoopBackedgeOperand());
+    SimpleLinearSum modified = ExtractLinearSum(phi->getLoopBackedgeOperand(), MathSpace::Infinite);
 
     if (modified.term != phi || modified.constant == 0) {
         return;