Swift: remove Tag nested alias in TrapLabel

Author: redsun82

swift/extractor/SwiftExtractor.cpp

@@ -79,7 +79,7 @@ static void extractFile(const SwiftExtractorConfiguration& config, swift::Source
 
   TrapOutput trap{trapStream};
   TrapArena arena{};
-  auto label = arena.allocateLabel<File::Tag>();
+  auto label = arena.allocateLabel<FileTag>();
   trap.assignStar(label);
   File f{};
   f.id = label;

swift/extractor/trap/TrapLabel.h

@@ -59,10 +59,8 @@ inline auto trapQuoted(const std::string& s) {
   return std::quoted(s, '"', '"');
 }
 
-template <typename TagParam>
+template <typename Tag>
 struct Binding {
-  using Tag = TagParam;
-
   TrapLabel<Tag> id;
 };