[lldb] Read Checksum from DWARF line tables (llvm#71458)

Read the MD5 checksum from DWARF line tables and store it in the
corresponding support files.

This is a re-land after fixing an off-by-one error in LLDB's
ParseSupportFilesFromPrologue (fixed in llvm#71984).

Author: JDevlieghere

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

@@ -236,8 +236,15 @@ ParseSupportFilesFromPrologue(const lldb::ModuleSP &module,
         remapped_file = std::move(*file_path);
     }
 
+    Checksum checksum;
+    if (prologue.ContentTypes.HasMD5) {
+      const llvm::DWARFDebugLine::FileNameEntry &file_name_entry =
+          prologue.getFileNameEntry(idx);
+      checksum = file_name_entry.Checksum;
+    }
+
     // Unconditionally add an entry, so the indices match up.
-    support_files.EmplaceBack(remapped_file, style);
+    support_files.EmplaceBack(remapped_file, style, checksum);
   }
 
   return support_files;