[turbofan]: Add a context relaxer reducer

src/code-stubs.cc

 // Copyright 2012 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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 488 matching lines @@
   Handle<JSFunction> inner = Handle<JSFunction>::cast(result.ToHandleChecked());
   // Just to make sure nobody calls this...
   inner->set_code(isolate()->builtins()->builtin(Builtins::kIllegal));
 
   Zone zone;
   // Build a "hybrid" CompilationInfo for a JSFunction/CodeStub pair.
   ParseInfo parse_info(&zone, inner);
   CompilationInfo info(&parse_info);
   info.SetFunctionType(GetCallInterfaceDescriptor().GetFunctionType());
   info.MarkAsContextSpecializing();
+  info.MarkAsDeoptimizationEnabled();
   info.SetStub(this);
   return info.GenerateCodeStub();
 }
 
 
 template<class StateType>
 void HydrogenCodeStub::TraceTransition(StateType from, StateType to) {
   // Note: Although a no-op transition is semantically OK, it is hinting at a
   // bug somewhere in our state transition machinery.
   DCHECK(from != to);
@@ skipping 560 matching lines @@
 
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 }  // namespace internal
 }  // namespace v8