Remove stale clang prebuilts and update clang-stable symlink.

Removing clang-2812033.
Removing clang-3016494.
Removing clang-3217047.
Removing clang-3688880.
Reset clang-stable to point to clang-3859424.

Test: Build aosp/master and verified NDK is only using clang-3362437.
Change-Id: I754d7a4e0c93bcef5f2d6393bf603bf6c987fb1d
658 files changed
tree: ad7b155f28c70b864297b06c1660e6a08bc2bcb2
  1. clang-3289846/
  2. clang-3362437/
  3. clang-3859424/
  4. OWNERS