Initial shot at deoptimizing JSCallFunction in Turbofan.

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 310a87a9ca91f67eaab83ad7b8cbc331e0a62a9e..7b19303fb04e51a3865f47404f94ff7d142e7715 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -147,8 +147,13 @@ class Linkage : public ZoneObject {
       Operator::Property properties,
       CallDescriptor::DeoptimizationSupport can_deoptimize, Zone* zone);
 
-  CallDescriptor* GetStubCallDescriptor(CodeStubInterfaceDescriptor* descriptor,
-                                        int stack_parameter_count = 0);
+  CallDescriptor* GetStubCallDescriptor(
+      CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count = 0,
+      CallDescriptor::DeoptimizationSupport can_deoptimize =
+          CallDescriptor::kCannotDeoptimize);
+  static CallDescriptor* GetStubCallDescriptor(
+      CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count,
+      CallDescriptor::DeoptimizationSupport can_deoptimize, Zone* zone);
 
   // Creates a call descriptor for simplified C calls that is appropriate
   // for the host platform. This simplified calling convention only supports