[builtins] Migrate StringToNumber to TurboFan 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 2832 matching lines @@
   // ----------- S t a t e -------------
   //  -- r3 : message_id as Smi
   //  -- lr : return address
   // -----------------------------------
   __ push(r3);
   __ LoadSmiLiteral(cp, Smi::FromInt(0));
   __ TailCallRuntime(Runtime::kAbort);
 }
 
 // static
-void Builtins::Generate_StringToNumber(MacroAssembler* masm) {
-  // The StringToNumber stub takes one argument in r2.
-  __ AssertString(r2);
-
-  // Check if string has a cached array index.
-  Label runtime;
-  __ LoadlW(r4, FieldMemOperand(r2, String::kHashFieldOffset));
-  __ And(r0, r4, Operand(String::kContainsCachedArrayIndexMask));
-  __ bne(&runtime);
-  __ IndexFromHash(r4, r2);
-  __ Ret();
-
-  __ bind(&runtime);
-  {
-    FrameScope frame(masm, StackFrame::INTERNAL);
-    // Push argument.
-    __ push(r2);
-    // We cannot use a tail call here because this builtin can also be called
-    // from wasm.
-    __ CallRuntime(Runtime::kStringToNumber);
-  }
-  __ Ret();
-}
-
-// static
 void Builtins::Generate_ToNumber(MacroAssembler* masm) {
   // The ToNumber stub takes one argument in r2.
   STATIC_ASSERT(kSmiTag == 0);
   __ TestIfSmi(r2);
   __ Ret(eq);
 
   __ CompareObjectType(r2, r3, r3, HEAP_NUMBER_TYPE);
   // r2: receiver
   // r3: receiver instance type
   __ Ret(eq);
@@ skipping 132 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390