ReaderWriter: Use ilist_noalloc_traits for TrieEdge, NFC

Adopt r280128 in lld, specializing ilist_alloc_traits rather than
reinventing the wheel.

llvm-svn: 280566
diff --git a/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp b/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
index 7246e4c..25d719c 100644
--- a/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
+++ b/lld/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
@@ -66,14 +66,9 @@
 
 
 namespace llvm {
-  using lld::mach_o::normalized::TrieEdge;
-  template <>
-  struct ilist_traits<TrieEdge> : public ilist_default_traits<TrieEdge> {
-    void deleteNode(TrieEdge *N) {}
-
-  private:
-    void createNode(const TrieEdge &);
-  };
+using lld::mach_o::normalized::TrieEdge;
+template <>
+struct ilist_alloc_traits<TrieEdge> : ilist_noalloc_traits<TrieEdge> {};
 } // namespace llvm