Update prebuilt Clang to r510928 (18.0.0). am: e634d45a65

Original change: https://android-review.googlesource.com/c/platform/prebuilts/clang/host/darwin-x86/+/2934850

Change-Id: I81dfb645e9454c53a2a460cc9a34d4dbf00a2bac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>