Check elimination now sets known successor branch of HCompareObjectEqAndBranch (correctness fix).

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 2b64f89ab28f7228f4ec2cbad69e6435b4132de1..b2f1708adec28fe4e915a0dc8d6baf310b938b5f 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3098,6 +3098,10 @@ void HCompareObjectEqAndBranch::PrintDataTo(StringStream* stream) {
 
 
 bool HCompareObjectEqAndBranch::KnownSuccessorBlock(HBasicBlock** block) {
+  if (known_successor_index() != kNoKnownSuccessorIndex) {
+    *block = SuccessorAt(known_successor_index());
+    return true;
+  }
   if (FLAG_fold_constants && left()->IsConstant() && right()->IsConstant()) {
     *block = HConstant::cast(left())->DataEquals(HConstant::cast(right()))
         ? FirstSuccessor() : SecondSuccessor();