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 7956437bd8790d6aa806095712812ca4348120f8..f47004a77df3bed904fa280e03bce00d4051a53e 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: