Implement inlined stack-check guards in TurboFan.

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 622f863929ab01eb4ff2485d45129d17a6456246..ad54f98fa9acf7cb24d994f5542608d321794abd 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -144,6 +144,9 @@ class MachineOperatorBuilder FINAL {
   // store [base + index], value
   const Operator* Store(StoreRepresentation rep);
 
+  // Access to the machine stack.
+  const Operator* LoadStackPointer();
+
   // Target machine word-size assumed by this builder.
   bool Is32() const { return word() == kRepWord32; }
   bool Is64() const { return word() == kRepWord64; }