[lldb] Add logging to ObjectFileMachO::ParseSymtab (llvm#70490)

I have a crash when parsing the dyld trie data and I want to ask the
originator to send me the (possibly corrupted) binary that's causing
this. This patch adds some logging to help pinpoint that file.

(cherry picked from commit d3cbf9f)

Author: JDevlieghere

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

@@ -2232,9 +2232,12 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
   if (!module_sp)
     return;
 
+  Log *log = GetLog(LLDBLog::Symbols);
+
   const FileSpec &file = m_file ? m_file : module_sp->GetFileSpec();
   const char *file_name = file.GetFilename().AsCString("<Unknown>");
   LLDB_SCOPED_TIMERF("ObjectFileMachO::ParseSymtab () module = %s", file_name);
+  LLDB_LOG(log, "Parsing symbol table for {0}", file_name);
   Progress progress(llvm::formatv("Parsing symbol table for {0}", file_name));
 
   llvm::MachO::symtab_command symtab_load_command = {0, 0, 0, 0, 0, 0};
@@ -2264,7 +2267,6 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
   lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic);
   uint32_t i;
   FileSpecList dylib_files;
-  Log *log = GetLog(LLDBLog::Symbols);
   llvm::StringRef g_objc_v2_prefix_class("_OBJC_CLASS_$_");
   llvm::StringRef g_objc_v2_prefix_metaclass("_OBJC_METACLASS_$_");
   llvm::StringRef g_objc_v2_prefix_ivar("_OBJC_IVAR_$_");
@@ -2665,7 +2667,9 @@ void ObjectFileMachO::ParseSymtab(Symtab &symtab) {
   std::set<lldb::addr_t> resolver_addresses;
   std::set<lldb::addr_t> symbol_file_addresses;
 
-  if (dyld_trie_data.GetByteSize() > 0) {
+  const size_t dyld_trie_data_size = dyld_trie_data.GetByteSize();
+  if (dyld_trie_data_size > 0) {
+    LLDB_LOG(log, "Parsing {0} bytes of dyld trie data", dyld_trie_data_size);
     SectionSP text_segment_sp =
         GetSectionList()->FindSectionByName(GetSegmentNameTEXT());
     lldb::addr_t text_segment_file_addr = LLDB_INVALID_ADDRESS;