[cleanup] Replace 0 and NULL with nullptr for objects files.

Fixing clang-tidy warning.

Bug: v8:8015
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ie05d919cfd5cc4447c00603c8a46e975ad85cce3
Reviewed-on: https://chromium-review.googlesource.com/1224378Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55901}

src/objects.cc

@@ -11018,15 +11018,13 @@ FlatStringReader::FlatStringReader(Isolate* isolate, Handle<String> str)
   PostGarbageCollection();
 }
 
-
 FlatStringReader::FlatStringReader(Isolate* isolate, Vector<const char> input)
     : Relocatable(isolate),
-      str_(0),
+      str_(nullptr),
       is_one_byte_(true),
       length_(input.length()),
       start_(input.start()) {}
 
-
 void FlatStringReader::PostGarbageCollection() {
   if (str_ == nullptr) return;
   Handle<String> str(str_);

src/objects/intl-objects.cc

@@ -164,7 +164,7 @@ bool Intl::RemoveLocaleScriptTag(const std::string& icu_locale,
                                  std::string* locale_less_script) {
   icu::Locale new_locale = icu::Locale::createCanonical(icu_locale.c_str());
   const char* icu_script = new_locale.getScript();
-  if (icu_script == NULL || strlen(icu_script) == 0) {
+  if (icu_script == nullptr || strlen(icu_script) == 0) {
     *locale_less_script = std::string();
     return false;
   }

src/objects/js-collator.cc

@@ -174,7 +174,7 @@ Handle<JSObject> JSCollator::ResolvedOptions(Isolate* isolate,
       // The spec forbids the search as a collation value in the
       // locale tag, so let's filter it out.
       status = U_ZERO_ERROR;
-      new_icu_locale.setKeywordValue(legacy_collation_key, NULL, status);
+      new_icu_locale.setKeywordValue(legacy_collation_key, nullptr, status);
       CHECK(U_SUCCESS(status));
 
       toLanguageTag(new_icu_locale, bcp47_locale_tag);
@@ -357,7 +357,7 @@ MaybeHandle<JSCollator> JSCollator::InitializeCollator(
     if ((value == "search") || (value == "standard")) {
       UErrorCode status = U_ZERO_ERROR;
       const char* key = uloc_toLegacyKey("co");
-      icu_locale.setKeywordValue(key, NULL, status);
+      icu_locale.setKeywordValue(key, nullptr, status);
       CHECK(U_SUCCESS(status));
     }
   }

src/objects/js-number-format.cc

@@ -261,7 +261,7 @@ MaybeHandle<JSNumberFormat> JSNumberFormat::Initialize(
     if (value == "native" || value == "traditio" || value == "finance") {
       // 10. Set numberFormat.[[NumberingSystem]] to r.[[nu]].
       UErrorCode status = U_ZERO_ERROR;
-      icu_locale.setKeywordValue("nu", NULL, status);
+      icu_locale.setKeywordValue("nu", nullptr, status);
       CHECK(U_SUCCESS(status));
     }
   }

src/objects/string.h

@@ -300,11 +300,11 @@ class String : public Name {
   // do any heap allocations.  This is useful when printing stack traces.
   std::unique_ptr<char[]> ToCString(AllowNullsFlag allow_nulls,
                                     RobustnessFlag robustness_flag, int offset,
-                                    int length, int* length_output = 0);
+                                    int length, int* length_output = nullptr);
   std::unique_ptr<char[]> ToCString(
       AllowNullsFlag allow_nulls = DISALLOW_NULLS,
       RobustnessFlag robustness_flag = FAST_STRING_TRAVERSAL,
-      int* length_output = 0);
+      int* length_output = nullptr);
 
   bool ComputeArrayIndex(uint32_t* index);