Distribute rustc_codegen_cranelift for arm64 macOS

Author: bjorn3

compiler/rustc_codegen_cranelift/Readme.md

@@ -70,7 +70,7 @@ For more docs on how to build and test see [build_system/usage.txt](build_system
 |FreeBSD|✅[^no-rustup]|❓|❓|❓|
 |AIX|❌[^xcoff]|N/A|N/A|❌[^xcoff]|
 |Other unixes|❓|❓|❓|❓|
-|macOS|✅|✅[^no-rustup]|N/A|N/A|
+|macOS|✅|✅|N/A|N/A|
 |Windows|✅[^no-rustup]|❌|N/A|N/A|
 
 ✅: Fully supported and tested

src/bootstrap/src/utils/helpers.rs

@@ -202,7 +202,9 @@ pub fn target_supports_cranelift_backend(target: TargetSelection) -> bool {
             || target.contains("aarch64")
             || target.contains("s390x")
             || target.contains("riscv64gc")
-    } else if target.contains("darwin") || target.is_windows() {
+    } else if target.contains("darwin") {
+        target.contains("x86_64") || target.contains("aarch64")
+    } else if target.is_windows() {
         target.contains("x86_64")
     } else {
         false

src/ci/github-actions/jobs.yml

@@ -326,6 +326,7 @@ auto:
       NO_DEBUG_ASSERTIONS: 1
       NO_OVERFLOW_CHECKS: 1
       DIST_REQUIRE_ALL_TOOLS: 1
+      CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-macos-m1
 
   # This target only needs to support 11.0 and up as nothing else supports the hardware