Revert "[libc++][libc++abi] Add tests for vendor-specific properties"

This reverts commit 9892d1644f62cf8f5133ee0d2ebafb56f6500cc1, which
causes clang test failures in libcxx tests.

GitOrigin-RevId: 138dc27186bed4565584387fc49d88b235a1e2ed
2 files changed