[turbofan] Implement OSR for outer loops.

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/bootstrapper.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 572 matching lines @@
 
 
 // Common operators.
 
 
 Bounds Typer::Visitor::TypeParameter(Node* node) {
   return Bounds::Unbounded(zone());
 }
 
 
+Bounds Typer::Visitor::TypeOsrValue(Node* node) {
+  // OSR values explicitly have type {None} before OSR form is deconstructed.
+  if (node->InputAt(0)->opcode() == IrOpcode::kOsrLoopEntry) {
+    return Bounds(Type::None(), Type::None());
+  }
+  // TODO(turbofan): preserve the type of OSR values after deconstruction.
+  return Bounds::Unbounded(zone());
+}
+
+
 Bounds Typer::Visitor::TypeInt32Constant(Node* node) {
   Factory* f = isolate()->factory();
   Handle<Object> number = f->NewNumber(OpParameter<int32_t>(node));
   return Bounds(Type::Intersect(
       Type::Range(number, number, zone()), Type::UntaggedSigned32(), zone()));
 }
 
 
 Bounds Typer::Visitor::TypeInt64Constant(Node* node) {
   // TODO(rossberg): This actually seems to be a PointerConstant so far...
@@ skipping 1489 matching lines @@
         // TODO(rossberg): Do we want some ClampedArray type to express this?
         break;
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8