[turbofan] Generalize AllocateStub to allow old space allocation.

src/compiler/change-lowering.cc

Index: src/compiler/change-lowering.cc
diff --git a/src/compiler/change-lowering.cc b/src/compiler/change-lowering.cc
index 6d273a2a162357743edfa0416b41e7bd3fb4f1d4..ecf62159703f1aee28e23a7918db5672948e1db2 100644
--- a/src/compiler/change-lowering.cc
+++ b/src/compiler/change-lowering.cc
@@ -561,32 +561,15 @@ Reduction ChangeLowering::StoreElement(Node* node) {
 
 Reduction ChangeLowering::Allocate(Node* node) {
   PretenureFlag pretenure = OpParameter<PretenureFlag>(node->op());
-  if (pretenure == NOT_TENURED) {
-    Callable callable = CodeFactory::AllocateInNewSpace(isolate());
-    Node* target = jsgraph()->HeapConstant(callable.code());
-    CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
-        isolate(), jsgraph()->zone(), callable.descriptor(), 0,
-        CallDescriptor::kNoFlags, Operator::kNoThrow);
-    const Operator* op = common()->Call(descriptor);
-    node->InsertInput(graph()->zone(), 0, target);
-    node->InsertInput(graph()->zone(), 2, jsgraph()->NoContextConstant());
-    NodeProperties::ChangeOp(node, op);
-  } else {
-    DCHECK_EQ(TENURED, pretenure);
-    AllocationSpace space = OLD_SPACE;
-    Runtime::FunctionId f = Runtime::kAllocateInTargetSpace;
-    Operator::Properties props = node->op()->properties();
-    CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
-        jsgraph()->zone(), f, 2, props, CallDescriptor::kNeedsFrameState);
-    ExternalReference ref(f, jsgraph()->isolate());
-    int32_t flags = AllocateTargetSpace::encode(space);
-    node->InsertInput(graph()->zone(), 0, jsgraph()->CEntryStubConstant(1));
-    node->InsertInput(graph()->zone(), 2, jsgraph()->SmiConstant(flags));
-    node->InsertInput(graph()->zone(), 3, jsgraph()->ExternalConstant(ref));
-    node->InsertInput(graph()->zone(), 4, jsgraph()->Int32Constant(2));
-    node->InsertInput(graph()->zone(), 5, jsgraph()->NoContextConstant());
-    NodeProperties::ChangeOp(node, common()->Call(desc));
-  }
+  Callable callable = CodeFactory::Allocate(isolate(), pretenure);
+  Node* target = jsgraph()->HeapConstant(callable.code());
+  CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
+      isolate(), jsgraph()->zone(), callable.descriptor(), 0,
+      CallDescriptor::kNoFlags, Operator::kNoThrow);
+  const Operator* op = common()->Call(descriptor);
+  node->InsertInput(graph()->zone(), 0, target);
+  node->InsertInput(graph()->zone(), 2, jsgraph()->NoContextConstant());
+  NodeProperties::ChangeOp(node, op);
   return Changed(node);
 }