[builtins] FastNewFunctionContextStub becomes a builtin

src/crankshaft/arm64/lithium-codegen-arm64.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.
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 
 #include "src/arm64/frames-arm64.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/arm64/lithium-gap-resolver-arm64.h"
 #include "src/crankshaft/hydrogen-osr.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 592 matching lines @@
     bool need_write_barrier = true;
     // Argument to NewContext is the function, which is in x1.
     int slots = info()->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
     Safepoint::DeoptMode deopt_mode = Safepoint::kNoLazyDeopt;
     if (info()->scope()->is_script_scope()) {
       __ Mov(x10, Operand(info()->scope()->scope_info()));
       __ Push(x1, x10);
       __ 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());
         __ Mov(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
-        __ CallStub(&stub);
-        // Result of FastNewFunctionContextStub is always in new space.
+        __ Call(callable.code(), RelocInfo::CODE_TARGET);
+        // Result of the FastNewFunctionContext builtin is always in new space.
         need_write_barrier = false;
       } else {
         __ Push(x1);
         __ Push(Smi::FromInt(info()->scope()->scope_type()));
         __ CallRuntime(Runtime::kNewFunctionContext);
       }
     }
     RecordSafepoint(deopt_mode);
     // Context is returned in x0. It replaces the context passed to us. It's
     // saved in the stack and kept live in cp.
@@ skipping 4952 matching lines @@
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 }  // namespace internal
 }  // namespace v8