[builtins][date] Fix -Wshadow warnings

Bug: v8:12244,v8:12245
Change-Id: I5fdc754432c7f619f4a32f92eb2da81beb23e8ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3278689Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77910}

src/builtins/builtins-date.cc

@@ -445,12 +445,12 @@ BUILTIN(DatePrototypeSetMinutes) {
 // ES6 section 20.3.4.25 Date.prototype.setMonth ( month, date )
 BUILTIN(DatePrototypeSetMonth) {
   HandleScope scope(isolate);
-  CHECK_RECEIVER(JSDate, date, "Date.prototype.setMonth");
+  CHECK_RECEIVER(JSDate, this_date, "Date.prototype.setMonth");
   int const argc = args.length() - 1;
   Handle<Object> month = args.atOrUndefined(isolate, 1);
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, month,
                                      Object::ToNumber(isolate, month));
-  double time_val = date->value().Number();
+  double time_val = this_date->value().Number();
   if (!std::isnan(time_val)) {
     int64_t const time_ms = static_cast<int64_t>(time_val);
     int64_t local_time_ms = isolate->date_cache()->ToLocal(time_ms);
@@ -468,7 +468,7 @@ BUILTIN(DatePrototypeSetMonth) {
     }
     time_val = MakeDate(MakeDay(year, m, dt), time_within_day);
   }
-  return SetLocalDateValue(isolate, date, time_val);
+  return SetLocalDateValue(isolate, this_date, time_val);
 }
 
 // ES6 section 20.3.4.26 Date.prototype.setSeconds ( sec, ms )
@@ -662,12 +662,12 @@ BUILTIN(DatePrototypeSetUTCMinutes) {
 // ES6 section 20.3.4.31 Date.prototype.setUTCMonth ( month, date )
 BUILTIN(DatePrototypeSetUTCMonth) {
   HandleScope scope(isolate);
-  CHECK_RECEIVER(JSDate, date, "Date.prototype.setUTCMonth");
+  CHECK_RECEIVER(JSDate, this_date, "Date.prototype.setUTCMonth");
   int const argc = args.length() - 1;
   Handle<Object> month = args.atOrUndefined(isolate, 1);
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, month,
                                      Object::ToNumber(isolate, month));
-  double time_val = date->value().Number();
+  double time_val = this_date->value().Number();
   if (!std::isnan(time_val)) {
     int64_t const time_ms = static_cast<int64_t>(time_val);
     int days = isolate->date_cache()->DaysFromTime(time_ms);
@@ -684,7 +684,7 @@ BUILTIN(DatePrototypeSetUTCMonth) {
     }
     time_val = MakeDate(MakeDay(year, m, dt), time_within_day);
   }
-  return *JSDate::SetValue(date, DateCache::TimeClip(time_val));
+  return *JSDate::SetValue(this_date, DateCache::TimeClip(time_val));
 }
 
 // ES6 section 20.3.4.34 Date.prototype.setUTCSeconds ( sec, ms )

src/date/dateparser-inl.h

@@ -94,9 +94,9 @@ bool DateParser::Parse(Isolate* isolate, base::Vector<Char> str, double* out) {
       } else if (scanner.SkipSymbol('.') && time.IsExpecting(n)) {
         time.Add(n);
         if (!scanner.Peek().IsNumber()) return false;
-        int n = ReadMilliseconds(scanner.Next());
-        if (n < 0) return false;
-        time.AddFinal(n);
+        int ms = ReadMilliseconds(scanner.Next());
+        if (ms < 0) return false;
+        time.AddFinal(ms);
       } else if (tz.IsExpecting(n)) {
         tz.SetAbsoluteMinute(n);
       } else if (time.IsExpecting(n)) {
@@ -138,9 +138,9 @@ bool DateParser::Parse(Isolate* isolate, base::Vector<Char> str, double* out) {
       int n = 0;
       int length = 0;
       if (scanner.Peek().IsNumber()) {
-        DateToken token = scanner.Next();
-        length = token.length();
-        n = token.number();
+        DateToken next_token = scanner.Next();
+        length = next_token.length();
+        n = next_token.number();
       }
       has_read_number = true;