Update LLVM to r416183c for M1 support.

There's an even newer LLVM that we should be using for r24, but for
now I'm staying on the current revision so we can keep r24 and r23
from diverging too much before we need to so testing is easier.

Test: ./checkbuild.py && ./run_tests.py
Bug: android/ndk#1544
Change-Id: I4d0cfb4dc4df6e7a3f42e7487de87ca43e56f379

docs/changelogs/Changelog-r23.md

@@ -30,13 +30,16 @@ For Android Studio issues, follow the docs on the [Android Studio site].
 
 ## r23b
 
+* Update LLVM to clang-r416183c, based on LLVM 12 development.
+  * [Issue 1544]: Now uses universal binaries for M1 Macs.
 * [Issue 1560]: Fixed pull-up of unsupported API levels when using the new CMake
   toolchain file. This affects CMake 3.21 and
   `ANDROID_USE_LEGACY_TOOLCHAIN_FILE=ON` use cases, and was the common case for
   AGP users with a `minSdkVersion` below 21.
 * [Issue 1573]: Fixed `ANDROID_USE_LEGACY_TOOLCHAIN_FILE` not being obeyed
   during CMake try-compile.
 
+[Issue 1544]: https://github.com/android/ndk/issues/1544
 [Issue 1560]: https://github.com/android/ndk/issues/1560
 [Issue 1573]: https://github.com/android/ndk/issues/1573
 

ndk/toolchains.py

@@ -22,7 +22,7 @@
 import ndk.paths
 
 
-CLANG_VERSION = 'clang-r416183b'
+CLANG_VERSION = 'clang-r416183c'
 
 
 HOST_TRIPLE_MAP = {