Update to clang-r450784c am: 6840b8959c

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2063319

Change-Id: Ic94f17f400c967275047e51a78827ff7fecb8d89
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>