[strong] Implement static restrictions on switch statement

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index c8c5835295eeb99c5df4600992958fcac2f50682..c819296ffcefb6a21b8e422873c9faab6ba91939 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -925,6 +925,8 @@ class Parser : public ParserBase<ParserTraits> {
   ZoneList<ImportDeclaration*>* ParseNamedImports(int pos, bool* ok);
   Statement* ParseStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseSubStatement(ZoneList<const AstRawString*>* labels, bool* ok);
+  Statement* ParseStatementAsUnlabelled(ZoneList<const AstRawString*>* labels,
+                                   bool* ok);
   Statement* ParseFunctionDeclaration(ZoneList<const AstRawString*>* names,
                                       bool* ok);
   Statement* ParseClassDeclaration(ZoneList<const AstRawString*>* names,