[builtins] Use uintptr indices in SharedArrayBuffer builtins

The CL fixes the following builtins:
  Atomics.add
  Atomics.and
  Atomics.compareExchange
  Atomics.exchange
  Atomics.load
  Atomics.or
  Atomics.store
  Atomics.sub
  Atomics.xor

Bug: v8:4153
Change-Id: Id6170fd093f6e2f9690838b4b789719ed2fc343c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1876847
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64541}

src/codegen/code-stub-assembler.cc

@@ -7540,38 +7540,6 @@ TNode<JSReceiver> CodeStubAssembler::ToObject_Inline(TNode<Context> context,
   return result.value();
 }
 
-TNode<Smi> CodeStubAssembler::ToSmiIndex(TNode<Context> context,
-                                         TNode<Object> input,
-                                         Label* range_error) {
-  TVARIABLE(Smi, result);
-  Label check_undefined(this), return_zero(this), defined(this),
-      negative_check(this), done(this);
-
-  GotoIfNot(TaggedIsSmi(input), &check_undefined);
-  result = CAST(input);
-  Goto(&negative_check);
-
-  BIND(&check_undefined);
-  Branch(IsUndefined(input), &return_zero, &defined);
-
-  BIND(&defined);
-  TNode<Number> integer_input =
-      CAST(CallBuiltin(Builtins::kToInteger_TruncateMinusZero, context, input));
-  GotoIfNot(TaggedIsSmi(integer_input), range_error);
-  result = CAST(integer_input);
-  Goto(&negative_check);
-
-  BIND(&negative_check);
-  Branch(SmiLessThan(result.value(), SmiConstant(0)), range_error, &done);
-
-  BIND(&return_zero);
-  result = SmiConstant(0);
-  Goto(&done);
-
-  BIND(&done);
-  return result.value();
-}
-
 TNode<Smi> CodeStubAssembler::ToSmiLength(TNode<Context> context,
                                           TNode<Object> input,
                                           Label* range_error) {

src/codegen/code-stub-assembler.h

@@ -2662,11 +2662,6 @@ class V8_EXPORT_PRIVATE CodeStubAssembler
     kTruncateMinusZero,
   };
 
-  // ES6 7.1.17 ToIndex, but jumps to range_error if the result is not a Smi.
-  // TODO(v8:4153): Use ToIndex() instead.
-  TNode<Smi> ToSmiIndex(TNode<Context> context, TNode<Object> input,
-                        Label* range_error);
-
   // ES6 7.1.15 ToLength, but jumps to range_error if the result is not a Smi.
   TNode<Smi> ToSmiLength(TNode<Context> context, TNode<Object> input,
                          Label* range_error);