[turbofan] Add checked load/store operators.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 474c0d98e20006c939bc7e34e25c16957a790232..35a340f0f4e46578e387fff656b1ab692f2bd2a0 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -53,6 +53,18 @@ std::ostream& operator<<(std::ostream&, StoreRepresentation);
 StoreRepresentation const& StoreRepresentationOf(Operator const*);
 
 
+// A CheckedLoad needs a MachineType.
+typedef MachineType CheckedLoadRepresentation;
+
+CheckedLoadRepresentation CheckedLoadRepresentationOf(Operator const*);
+
+
+// A CheckedStore needs a MachineType.
+typedef MachineType CheckedStoreRepresentation;
+
+CheckedStoreRepresentation CheckedStoreRepresentationOf(Operator const*);
+
+
 // Interface for building machine-level operators. These operators are
 // machine-level but machine-independent and thus define a language suitable
 // for generating code to run on architectures such as ia32, x64, arm, etc.
@@ -174,6 +186,11 @@ class MachineOperatorBuilder FINAL : public ZoneObject {
   // Access to the machine stack.
   const Operator* LoadStackPointer();
 
+  // checked-load heap, index, length
+  const Operator* CheckedLoad(CheckedLoadRepresentation);
+  // checked-store heap, index, length, value
+  const Operator* CheckedStore(CheckedStoreRepresentation);
+
   // Target machine word-size assumed by this builder.
   bool Is32() const { return word() == kRepWord32; }
   bool Is64() const { return word() == kRepWord64; }