[builtins] Migrate StringToNumber to TurboFan builtin.

src/builtins/arm64/builtins-arm64.cc

Index: src/builtins/arm64/builtins-arm64.cc
diff --git a/src/builtins/arm64/builtins-arm64.cc b/src/builtins/arm64/builtins-arm64.cc
index 7d7aed66ad27b963816b2e5be30b39987cfe991b..3c5f6dbd603994d4b31ba2895c839f768ea2b810 100644
--- a/src/builtins/arm64/builtins-arm64.cc
+++ b/src/builtins/arm64/builtins-arm64.cc
@@ -2847,31 +2847,6 @@ void Builtins::Generate_Abort(MacroAssembler* masm) {
 }
 
 // static
-void Builtins::Generate_StringToNumber(MacroAssembler* masm) {
-  // The StringToNumber stub takes one argument in x0.
-  __ AssertString(x0);
-
-  // Check if string has a cached array index.
-  Label runtime;
-  __ Ldr(x2, FieldMemOperand(x0, String::kHashFieldOffset));
-  __ Tst(x2, Operand(String::kContainsCachedArrayIndexMask));
-  __ B(ne, &runtime);
-  __ IndexFromHash(x2, x0);
-  __ Ret();
-
-  __ Bind(&runtime);
-  {
-    FrameScope frame(masm, StackFrame::INTERNAL);
-    // Push argument.
-    __ Push(x0);
-    // 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 x0.
   Label not_smi;