[torque] Add linter rule for 'label' naming convention

R=tebbi@chromium.org

Bug: v8:7793
Change-Id: I6690ae59743054e8171bffbf722eb486f468ac48
Reviewed-on: https://chromium-review.googlesource.com/1228062Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#55985}

src/torque/torque-parser.cc

@@ -711,6 +711,9 @@ base::Optional<ParseResult> MakeForLoopStatement(
 
 base::Optional<ParseResult> MakeLabelBlock(ParseResultIterator* child_results) {
   auto label = child_results->NextAs<std::string>();
+  if (!IsUpperCamelCase(label)) {
+    NamingConventionError("Label", label, "UpperCamelCase");
+  }
   auto parameters = child_results->NextAs<ParameterList>();
   auto body = child_results->NextAs<Statement*>();
   LabelBlock* result =
@@ -840,6 +843,9 @@ base::Optional<ParseResult> MakeConditionalExpression(
 base::Optional<ParseResult> MakeLabelAndTypes(
     ParseResultIterator* child_results) {
   auto name = child_results->NextAs<std::string>();
+  if (!IsUpperCamelCase(name)) {
+    NamingConventionError("Label", name, "UpperCamelCase");
+  }
   auto types = child_results->NextAs<std::vector<TypeExpression*>>();
   return ParseResult{LabelAndTypes{std::move(name), std::move(types)}};
 }

third_party/v8/builtins/array-sort.tq

@@ -1747,9 +1747,9 @@ module array {
     sortState[kBailoutStatusIdx] = kSuccess;
 
     try {
-      const a: JSArray = Cast<JSArray>(obj) otherwise slow;
+      const a: JSArray = Cast<JSArray>(obj) otherwise Slow;
       const elementsKind: ElementsKind = map.elements_kind;
-      if (!IsFastElementsKind(elementsKind)) goto slow;
+      if (!IsFastElementsKind(elementsKind)) goto Slow;
 
       // 3. Let len be ? ToLength(? Get(obj, "length")).
       const len: Smi = a.length_fast;
@@ -1771,7 +1771,7 @@ module array {
       }
       ArrayTimSort(context, sortState, nofNonUndefined);
     }
-    label slow {
+    label Slow {
       // 3. Let len be ? ToLength(? Get(obj, "length")).
       const len: Number = GetLengthProperty(context, obj);