M1 LLVM toolchain

[DanAlbert]

Subtask for #1299

clang-r416183c already has this, so we just need to update from clang-r416183b.

[DanAlbert]

https://android-review.googlesource.com/c/platform/ndk/+/1815336/ does this for r24. Will cherry-pick for r23b as well

[rprichard]

This is fixed in r23b and in r24-beta1.