Merged r16406, r16431 into 3.19 branch.

src/hydrogen-environment-liveness.cc

Index: src/hydrogen-environment-liveness.cc
diff --git a/src/hydrogen-environment-liveness.cc b/src/hydrogen-environment-liveness.cc
index b722e00364f33b8696007e70191f48b01b5ed7f2..76c9c237901ff63cd6b86f95e7261e8388e2b503 100644
--- a/src/hydrogen-environment-liveness.cc
+++ b/src/hydrogen-environment-liveness.cc
@@ -172,11 +172,7 @@ void EnvironmentSlotLivenessAnalyzer::UpdateLivenessAtInstruction(
       live->Clear();
       for (int i = 0; i < enter->return_targets()->length(); ++i) {
         int return_id = enter->return_targets()->at(i)->block_id();
-        // When an AbnormalExit is involved, it can happen that the return
-        // target block doesn't actually exist.
-        if (return_id < live_at_block_start_->length()) {
-          live->Union(*live_at_block_start_->at(return_id));
-        }
+        live->Union(*live_at_block_start_->at(return_id));
       }
       last_simulate_ = NULL;
       break;