Remove constructor and unused function (NFC)

lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp

struct SectionInfo {
     VMRange vm_range;
     SectionSP section_sp;
   };
   SectionList *m_section_list;
   std::vector<SectionInfo> m_section_infos;
 };
 
 struct TrieEntry {
-  TrieEntry()
-      : name(), address(LLDB_INVALID_ADDRESS), flags(0), other(0),
-        import_name() {}
-
-  void Clear() {
-    name.Clear();
-    address = LLDB_INVALID_ADDRESS;
-    flags = 0;
-    other = 0;
-    import_name.Clear();
-  }
-
   void Dump() const {
     printf("0x%16.16llx 0x%16.16llx 0x%16.16llx \"%s\"",
            static_cast<unsigned long long>(address),
            static_cast<unsigned long long>(flags),
            static_cast<unsigned long long>(other), name.GetCString());
     if (import_name)
       printf(" -> \"%s\"\n", import_name.GetCString());
     else
       printf("\n");
   }
   ConstString name;
-  uint64_t address;
-  uint64_t flags;
-  uint64_t other;
+  uint64_t address = LLDB_INVALID_ADDRESS;
+  uint64_t flags = 0;
+  uint64_t other = 0;
   ConstString import_name;
 };
 
 struct TrieEntryWithOffset {
   lldb::offset_t nodeOffset;
   TrieEntry entry;
 
   TrieEntryWithOffset(lldb::offset_t offset) : nodeOffset(offset), entry() {}