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

src/ppc/lithium-codegen-ppc.h

Index: src/ppc/lithium-codegen-ppc.h
diff --git a/src/ppc/lithium-codegen-ppc.h b/src/ppc/lithium-codegen-ppc.h
index 248792f06031adfafde7332b84148d07a4056b8c..5ebb72e55c10554eab0f6d6087cf402b72ebfd7a 100644
--- a/src/ppc/lithium-codegen-ppc.h
+++ b/src/ppc/lithium-codegen-ppc.h
@@ -108,6 +108,7 @@ class LCodeGen : public LCodeGenBase {
   void DoDeferredTaggedToI(LTaggedToI* instr);
   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
   void DoDeferredStackCheck(LStackCheck* instr);
+  void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
   void DoDeferredAllocate(LAllocate* instr);