[turbofan] Add SimplifiedOperator::Allocate operator.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 855de8aa49242d51da415600f3679b783076fecd..8000a930c291f490d55df84aded23d3d415e7b4c 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -57,6 +57,8 @@ class JSTypedLowering final : public Reducer {
   Reduction ReduceJSCreateClosure(Node* node);
   Reduction ReduceJSCreateLiteralArray(Node* node);
   Reduction ReduceJSCreateLiteralObject(Node* node);
+  Reduction ReduceJSCreateWithContext(Node* node);
+  Reduction ReduceJSCreateBlockContext(Node* node);
   Reduction ReduceNumberBinop(Node* node, const Operator* numberOp);
   Reduction ReduceInt32Binop(Node* node, const Operator* intOp);
   Reduction ReduceUI32Shift(Node* node, Signedness left_signedness,
@@ -77,6 +79,9 @@ class JSTypedLowering final : public Reducer {
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
   MachineOperatorBuilder* machine() const;
 
+  // Limits up to which context allocations are inlined.
+  static const int kBlockContextAllocationLimit = 16;
+
   JSGraph* jsgraph_;
   SimplifiedOperatorBuilder simplified_;
   ZoneVector<Node*> conversions_;  // Cache inserted JSToXXX() conversions.