Update prebuilt Clang to build 4630689.

Built from version 6.0.1
based on r316199.

Bug: http://b/73127367
Test: N/A
Change-Id: I4503369664cd175a74d840c676833d754a18282d
1876 files changed
tree: 33e98c04e9f82e66ce8c345d7d21a00026c09378
  1. clang-4393122/
  2. clang-4479392/
  3. clang-4579689/
  4. clang-4630689/
  5. OWNERS