Dump bit width from classes

The ABI tool dumps bit width for bit fields in classes. It reports any
bit width change as ABI difference. It can detect the case where a bit
field is resized without affecting the other fields.

Test: ANDROID_BUILD_TOP=`realpath .` \
      PATH=$PATH:`realpath out/soong/dist/bin` \
      development/vndk/tools/header-checker/tests/test.py
Bug: 323447559
Change-Id: I669155a98a870b87a1ca8ea44f3f848358b304a8
14 files changed