[builtins] Migrate StringToNumber to TurboFan builtin.

src/builtins/mips64/builtins-mips64.cc

Index: src/builtins/mips64/builtins-mips64.cc
diff --git a/src/builtins/mips64/builtins-mips64.cc b/src/builtins/mips64/builtins-mips64.cc
index b82e76d05c68cf084ff335c07f8666ab62525be0..ca821764c0572b53d4ce9d435ad7fa1302c2ca9e 100644
--- a/src/builtins/mips64/builtins-mips64.cc
+++ b/src/builtins/mips64/builtins-mips64.cc
@@ -2822,31 +2822,6 @@ void Builtins::Generate_Abort(MacroAssembler* masm) {
 }
 
 // static
-void Builtins::Generate_StringToNumber(MacroAssembler* masm) {
-  // The StringToNumber stub takes on argument in a0.
-  __ AssertString(a0);
-
-  // Check if string has a cached array index.
-  Label runtime;
-  __ lwu(a2, FieldMemOperand(a0, String::kHashFieldOffset));
-  __ And(at, a2, Operand(String::kContainsCachedArrayIndexMask));
-  __ Branch(&runtime, ne, at, Operand(zero_reg));
-  __ IndexFromHash(a2, v0);
-  __ Ret();
-
-  __ bind(&runtime);
-  {
-    FrameScope frame(masm, StackFrame::INTERNAL);
-    // Push argument.
-    __ Push(a0);
-    // 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 a0.
   Label not_smi;