Build czar switchover

[Akira Hatanaka via cfe-commits]

Hi Volodymyr and Azhar,

Here is the current status of the bots:

1. Automerger
Automerger has almost caught up. [apple/master -> internal/master] has just 13 unmerged commits and no conflicts.

2. BlueDragon
There are a few clang-1200 bots that are failing.

- The following bot is failing because it can’t find libLTO:
  https://smooshbase.apple.com/ci/view/BuildCzar/job/apple-clang-ios-san/job/internal%252Fclang%252F1200/ <https://smooshbase.apple.com/ci/view/BuildCzar/job/apple-clang-ios-san/job/internal%2Fclang%2F1200/>
  I’ve filed a radar for it (rdar://problem/61485027 <rdar://problem/61485027>).

- I expect this one to turn green soon:
  https://smooshbase.apple.com/ci/view/BuildCzar/job/apple-clang-ios-stage2-RLTO/

  I’ve already fixed the failing tests by requiring support for matrix-type when -fenable-matrix is passed on the command line.

- This one is failing because three opt pipeline tests are failing:
  https://smooshbase.apple.com/ci/view/BuildCzar/job/apple-clang-xcode-stage1-RA/job/internal%252Fclang%252F1200/

  The following commit might have to be cherry picked to 1200 to fix the tests. I’ll file a radar and ask Florian to take a look.

 Author: Florian Hahn <florian_hahn at apple.com>
 Date:   Tue Apr 7 14:44:19 2020 +0100

     [Matrix] Preserve LI in TileBuilder.

3. GreenDragon
A few ASAN tests have been failing on the expensive check bot (http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-expensive/). I’ll file a radar and take a look at it today. 

The ASAN bot (http://lab.llvm.org:8080/green/job/clang-stage2-cmake-RgSan/) started failing this morning. I haven’t investigated why it’s failing.
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