New hydrogen instruction to reduce cost of growing an array on keyed stores.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 2db3c43c68ea08686ee324cef5a3d3089db0acc4..974b65b715fb6ec86c0026d201a682d481ace8af 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -874,6 +874,7 @@ bool HInstruction::CanDeoptimize() {
     case HValue::kLoadKeyed:
     case HValue::kLoadKeyedGeneric:
     case HValue::kMathFloorOfDiv:
+    case HValue::kMaybeGrowElements:
     case HValue::kMod:
     case HValue::kMul:
     case HValue::kOsrEntry: