tree 9c4ae1f92fcc2b6a1d1afd8bcc69c6625e54e634
parent 4c6962d953fd7844c155d05e4f79a84cdfe7d150
author Yifan Hong <elsk@google.com> 1548972780 -0800
committer Yifan Hong <elsk@google.com> 1548978412 -0800

Fix and add test to CompatibilityMatrix::combine()

It didn't report error for some cases. Fail in such
case and add tests to guard this.

Bug: 78943004
Test: vintf_object_test
Change-Id: I74546c83c63d8afbc8b54c05bc5ee946d7e9752d