Make UBSan happy.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 2cbf5040010acf1a9707ab52638312b5a6620aad..bea3cea9f68865657cac588f75a589eb6fed8029 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1922,15 +1922,18 @@ Range* HMathFloorOfDiv::InferRange(Zone* zone) {
 }
 
 
+// Returns the absolute value of its argument minus one, avoiding undefined
+// behavior at kMinInt.
+static int32_t AbsMinus1(int32_t a) { return a < 0 ? -(a + 1) : (a - 1); }
+
+
 Range* HMod::InferRange(Zone* zone) {
   if (representation().IsInteger32()) {
     Range* a = left()->range();
     Range* b = right()->range();
 
-    // The magnitude of the modulus is bounded by the right operand. Note that
-    // apart for the cases involving kMinInt, the calculation below is the same
-    // as Max(Abs(b->lower()), Abs(b->upper())) - 1.
-    int32_t positive_bound = -(Min(NegAbs(b->lower()), NegAbs(b->upper())) + 1);
+    // The magnitude of the modulus is bounded by the right operand.
+    int32_t positive_bound = Max(AbsMinus1(b->lower()), AbsMinus1(b->upper()));
 
     // The result of the modulo operation has the sign of its left operand.
     bool left_can_be_negative = a->CanBeMinusZero() || a->CanBeNegative();