Revert "Upgrade to clang-r530567"

This reverts commit b4f05f1a.

Reason for revert: Likely culprit for b/352459464  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Iaea4511402b2818904f84e512f4f77487d0efafc