Update prebuilt Clang to r416183b1 (12.0.7).

clang 12.0.7 (based on r416183b1) from build 7485623.

Bug: http://b/189328402
Test: N/A
Change-Id: Ib39ec1ed23e24a68419b18d5806fec03572b8ea9
4544 files changed