[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler builtin

src/builtins/arm64/builtins-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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 361 matching lines @@
   {
     __ LoadRoot(x0, Heap::kempty_stringRootIndex);
     __ Drop(1);
     __ Ret();
   }
 
   // 3a. Convert x0 to a string.
   __ Bind(&to_string);
   {
     FrameScope scope(masm, StackFrame::MANUAL);
-    ToStringStub stub(masm->isolate());
     __ SmiTag(x2);
     __ EnterBuiltinFrame(cp, x1, x2);
-    __ CallStub(&stub);
+    __ Call(masm->isolate()->builtins()->ToString(), RelocInfo::CODE_TARGET);
     __ LeaveBuiltinFrame(cp, x1, x2);
     __ SmiUntag(x2);
   }
   __ b(&drop_frame_and_ret);
 
   // 3b. Convert symbol in x0 to a string.
   __ Bind(&symbol_descriptive_string);
   {
     __ Drop(x2);
     __ Drop(1);
@@ skipping 39 matching lines @@
   }
 
   // 3. Make sure x2 is a string.
   {
     Label convert, done_convert;
     __ JumpIfSmi(x2, &convert);
     __ JumpIfObjectType(x2, x4, x4, FIRST_NONSTRING_TYPE, &done_convert, lo);
     __ Bind(&convert);
     {
       FrameScope scope(masm, StackFrame::MANUAL);
-      ToStringStub stub(masm->isolate());
       __ SmiTag(x6);
       __ EnterBuiltinFrame(cp, x1, x6);
       __ Push(x3);
       __ Move(x0, x2);
-      __ CallStub(&stub);
+      __ Call(masm->isolate()->builtins()->ToString(), RelocInfo::CODE_TARGET);
       __ Move(x2, x0);
       __ Pop(x3);
       __ LeaveBuiltinFrame(cp, x1, x6);
       __ SmiUntag(x6);
     }
     __ Bind(&done_convert);
   }
 
   // 4. Check if new target and constructor differ.
   Label drop_frame_and_ret, new_object;
@@ skipping 2565 matching lines @@
     __ Unreachable();
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM