Add crashpad_info, MachOImageAnnotationsReader, and its test

util/mac/mach_o_image_reader.h

Index: util/mac/mach_o_image_reader.h
diff --git a/util/mac/mach_o_image_reader.h b/util/mac/mach_o_image_reader.h
index ad39611103b8a50ab26298df495136b7fdcaf0c9..a7e71167aa97dfa1bb3f4b8ba0599ad79e754681 100644
--- a/util/mac/mach_o_image_reader.h
+++ b/util/mac/mach_o_image_reader.h
@@ -39,6 +39,8 @@ class ProcessReader;
 //! This class is capable of reading both 32-bit (`mach_header`/`MH_MAGIC`) and
 //! 64-bit (`mach_header_64`/`MH_MAGIC_64`) images based on the bitness of the
 //! remote process.
+//!
+//! \sa MachOImageAnnotationsReader
 class MachOImageReader {
  public:
   MachOImageReader();