[turbofan] Introduce JSStackCheck operator.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1501 matching lines @@
     case Runtime::kInlineConstructDouble:
       return Bounds(Type::None(zone()), Type::Number());
     default:
       break;
   }
   return Bounds::Unbounded(zone());
 }
 
 
 Bounds Typer::Visitor::TypeJSDebugger(Node* node) {
+  UNREACHABLE();
+  return Bounds();
+}
+
+
+Bounds Typer::Visitor::TypeJSStackCheck(Node* node) {
   return Bounds::Unbounded(zone());
 }
 
 
 // Simplified operators.
 
 
 Bounds Typer::Visitor::TypeAnyToBoolean(Node* node) {
   return TypeUnaryOp(node, ToBoolean);
 }
@@ skipping 679 matching lines @@
       TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8