Inline Array.shift() fast path instead of using a code stub.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index a91b9b7f343362043dbbf1d58f6a80c4b4ee5f59..6303cd13c7a583d13e906651c7cb81e39698c49d 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -779,11 +779,9 @@ bool HInstruction::CanDeoptimize() {
     case HValue::kArgumentsElements:
     case HValue::kArgumentsLength:
     case HValue::kArgumentsObject:
-    case HValue::kArrayShift:
     case HValue::kBlockEntry:
     case HValue::kBoundsCheckBaseIndexInformation:
     case HValue::kCallFunction:
-    case HValue::kCallJSFunction:
     case HValue::kCallNew:
     case HValue::kCallNewArray:
     case HValue::kCallStub:
@@ -849,6 +847,7 @@ bool HInstruction::CanDeoptimize() {
     case HValue::kBitwise:
     case HValue::kBoundsCheck:
     case HValue::kBranch:
+    case HValue::kCallJSFunction:
     case HValue::kCallRuntime:
     case HValue::kChange:
     case HValue::kCheckHeapObject:
@@ -3609,12 +3608,6 @@ void HTransitionElementsKind::PrintDataTo(StringStream* stream) {
 }
 
 
-void HArrayShift::PrintDataTo(StringStream* stream) {
-  object()->PrintNameTo(stream);
-  stream->Add(" [%s]", ElementsAccessor::ForKind(kind())->name());
-}
-
-
 void HLoadGlobalCell::PrintDataTo(StringStream* stream) {
   stream->Add("[%p]", *cell().handle());
   if (!details_.IsDontDelete()) stream->Add(" (deleteable)");