Eliminate intentional conversion from Smi to Int32 in HMul

src/hydrogen-canonicalize.cc

Index: src/hydrogen-canonicalize.cc
diff --git a/src/hydrogen-canonicalize.cc b/src/hydrogen-canonicalize.cc
index 643234392d0ac942d719dc3cb71a87b29ab5cf7e..4d96415e6a8142b40a2e74ed6c17011bb18bf071 100644
--- a/src/hydrogen-canonicalize.cc
+++ b/src/hydrogen-canonicalize.cc
@@ -48,6 +48,10 @@ void HCanonicalizePhase::Run() {
           if (instr->HasAtLeastOneUseWithFlagAndNoneWithout(
                   HInstruction::kTruncatingToSmi)) {
             instr->SetFlag(HInstruction::kAllUsesTruncatingToSmi);
+          } else if (instr->HasAtLeastOneUseWithFlagAndNoneWithout(
+                         HInstruction::kTruncatingToInt32)) {
+            // Avoid redundant minus zero check
+            instr->SetFlag(HInstruction::kAllUsesTruncatingToInt32);
           }
         }
       }