Update llvm-rs-cc version to 23 for M.

Bug: 22179874

This change updates the compiler version, as well as marks the new APIs
usable by Android M.

Change-Id: I2a943274a701e6301b6c41ac3bb4302e0a66b9d0
(cherry picked from commit bd0a7ddceac6c135ea975cefbac73877a1f9dae7)
7 files changed