[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler builtin

src/builtins/s390/builtins-s390.cc

 // Copyright 2014 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_S390
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 378 matching lines @@
   __ bind(&no_arguments);
   {
     __ LoadRoot(r2, Heap::kempty_stringRootIndex);
     __ Ret(1);
   }
 
   // 3a. Convert r2 to a string.
   __ bind(&to_string);
   {
     FrameScope scope(masm, StackFrame::MANUAL);
-    ToStringStub stub(masm->isolate());
     __ SmiTag(r4);
     __ EnterBuiltinFrame(cp, r3, r4);
-    __ CallStub(&stub);
+    __ Call(masm->isolate()->builtins()->ToString(), RelocInfo::CODE_TARGET);
     __ LeaveBuiltinFrame(cp, r3, r4);
     __ SmiUntag(r4);
   }
   __ b(&drop_frame_and_ret);
   // 3b. Convert symbol in r2 to a string.
   __ bind(&symbol_descriptive_string);
   {
     __ Drop(r4);
     __ Drop(1);
     __ Push(r2);
@@ skipping 39 matching lines @@
 
   // 3. Make sure r4 is a string.
   {
     Label convert, done_convert;
     __ JumpIfSmi(r4, &convert);
     __ CompareObjectType(r4, r6, r6, FIRST_NONSTRING_TYPE);
     __ blt(&done_convert);
     __ bind(&convert);
     {
       FrameScope scope(masm, StackFrame::MANUAL);
-      ToStringStub stub(masm->isolate());
       __ SmiTag(r8);
       __ EnterBuiltinFrame(cp, r3, r8);
       __ Push(r5);
       __ LoadRR(r2, r4);
-      __ CallStub(&stub);
+      __ Call(masm->isolate()->builtins()->ToString(), RelocInfo::CODE_TARGET);
       __ LoadRR(r4, r2);
       __ Pop(r5);
       __ LeaveBuiltinFrame(cp, r3, r8);
       __ SmiUntag(r8);
     }
     __ bind(&done_convert);
   }
 
   // 4. Check if new target and constructor differ.
   Label drop_frame_and_ret, new_object;
@@ skipping 2545 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390