Merge 15827, 15842, and 15912 into 3.19

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 8c660597ab891c8f0d69d05646002eded60592d8..b722e00364f33b8696007e70191f48b01b5ed7f2 100644
--- a/src/hydrogen-environment-liveness.cc
+++ b/src/hydrogen-environment-liveness.cc
@@ -181,15 +181,6 @@ void EnvironmentSlotLivenessAnalyzer::UpdateLivenessAtInstruction(
       last_simulate_ = NULL;
       break;
     }
-    case HValue::kDeoptimize: {
-      // Keep all environment slots alive.
-      HDeoptimize* deopt = HDeoptimize::cast(instr);
-      for (int i = deopt->first_local_index();
-           i < deopt->first_expression_index(); ++i) {
-        live->Add(i);
-      }
-      break;
-    }
     case HValue::kSimulate:
       last_simulate_ = HSimulate::cast(instr);
       went_live_since_last_simulate_->Clear();