Clean up dead code after spread desugaring

src/contexts.cc

 // Copyright 2011 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/contexts.h"
 
 #include "src/ast/scopeinfo.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 524 matching lines @@
 
 
 int Context::IntrinsicIndexForName(Handle<String> string) {
   NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(COMPARE_NAME);
   return kNotFound;
 }
 
 #undef COMPARE_NAME
 
 
-bool Context::IsJSBuiltin(Handle<Context> native_context,
-                          Handle<JSFunction> function) {
-#define COMPARE_FUNCTION(index, type, name) \
-  if (*function == native_context->get(index)) return true;
-  NATIVE_CONTEXT_JS_BUILTINS(COMPARE_FUNCTION);
-#undef COMPARE_FUNCTION
-  return false;
-}
-
-
 #ifdef DEBUG
 
 bool Context::IsBootstrappingOrNativeContext(Isolate* isolate, Object* object) {
   // During bootstrapping we allow all objects to pass as global
   // objects. This is necessary to fix circular dependencies.
   return isolate->heap()->gc_state() != Heap::NOT_IN_GC ||
          isolate->bootstrapper()->IsActive() || object->IsNativeContext();
 }
 
 
@@ skipping 16 matching lines @@
 
   int previous_value = errors_thrown()->value();
   set_errors_thrown(Smi::FromInt(previous_value + 1));
 }
 
 
 int Context::GetErrorsThrown() { return errors_thrown()->value(); }
 
 }  // namespace internal
 }  // namespace v8