[builtins] Migrate StringToNumber to TurboFan builtin.

src/builtins/arm/builtins-arm.cc

Index: src/builtins/arm/builtins-arm.cc
diff --git a/src/builtins/arm/builtins-arm.cc b/src/builtins/arm/builtins-arm.cc
index e391cf199689dd7b7e0059565b2b9e288b93c2d4..eb4cee2ed8088e082c268569b07edf9a82c90499 100644
--- a/src/builtins/arm/builtins-arm.cc
+++ b/src/builtins/arm/builtins-arm.cc
@@ -2759,31 +2759,6 @@ void Builtins::Generate_Abort(MacroAssembler* masm) {
   __ TailCallRuntime(Runtime::kAbort);
 }
 
-// static
-void Builtins::Generate_StringToNumber(MacroAssembler* masm) {
-  // The StringToNumber stub takes one argument in r0.
-  __ AssertString(r0);
-
-  // Check if string has a cached array index.
-  Label runtime;
-  __ ldr(r2, FieldMemOperand(r0, String::kHashFieldOffset));
-  __ tst(r2, Operand(String::kContainsCachedArrayIndexMask));
-  __ b(ne, &runtime);
-  __ IndexFromHash(r2, r0);
-  __ Ret();
-
-  __ bind(&runtime);
-  {
-    FrameScope frame(masm, StackFrame::INTERNAL);
-    // Push argument.
-    __ Push(r0);
-    // We cannot use a tail call here because this builtin can also be called
-    // from wasm.
-    __ CallRuntime(Runtime::kStringToNumber);
-  }
-  __ Ret();
-}
-
 void Builtins::Generate_ToNumber(MacroAssembler* masm) {
   // The ToNumber stub takes one argument in r0.
   STATIC_ASSERT(kSmiTag == 0);