Update prebuilt Clang to r349610b.

clang 8.0.9 (based on r349610b) from build 5331180.

Bug: http://b/122481018
Test: N/A
Change-Id: Ib2ae7a519e8cc0c0214a0715c98ee0a1a1e69e0f
(cherry picked from commit f99a3185983fdeeb5d5801d9a946d09683ea8f54)
2383 files changed