[builtins] FastNewFunctionContextStub becomes a builtin

src/crankshaft/x64/lithium-codegen-x64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
+#include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/hydrogen-osr.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 152 matching lines @@
     bool need_write_barrier = true;
     // Argument to NewContext is the function, which is still in rdi.
     int slots = info_->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
     Safepoint::DeoptMode deopt_mode = Safepoint::kNoLazyDeopt;
     if (info()->scope()->is_script_scope()) {
       __ Push(rdi);
       __ Push(info()->scope()->scope_info());
       __ CallRuntime(Runtime::kNewScriptContext);
       deopt_mode = Safepoint::kLazyDeopt;
     } else {
-      if (slots <= FastNewFunctionContextStub::MaximumSlots()) {
-        FastNewFunctionContextStub stub(isolate(),
-                                        info()->scope()->scope_type());
+      if (slots <=
+          ConstructorBuiltinsAssembler::MaximumFunctionContextSlots()) {
+        Callable callable = CodeFactory::FastNewFunctionContext(
+            isolate(), info()->scope()->scope_type());
         __ Set(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
-        __ CallStub(&stub);
+        __ Call(callable.code(), RelocInfo::CODE_TARGET);
         // Result of FastNewFunctionContextStub is always in new space.
         need_write_barrier = false;
       } else {
         __ Push(rdi);
         __ Push(Smi::FromInt(info()->scope()->scope_type()));
         __ CallRuntime(Runtime::kNewFunctionContext);
       }
     }
     RecordSafepoint(deopt_mode);
 
@@ skipping 5234 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64