Disable docs on aarch64-apple-darwin.

This builder is the slowest in the fleet. This should cut a considerable
amount of time. The manifest should now include the docs from
x86_64-apple-darwin. Although those docs are slightly different, it
should be close enough. When aarch64-apple-darwin heads towards tier 1,
we can revisit whether or not to re-enable the docs.

.github/workflows/ci.yml

@@ -320,7 +320,7 @@ jobs:
           - name: dist-aarch64-apple
             env:
               SCRIPT: "./x.py dist --stage 2"
-              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --host=aarch64-apple-darwin --target=aarch64-apple-darwin --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
+              RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --host=aarch64-apple-darwin --target=aarch64-apple-darwin --enable-full-tools --enable-sanitizers --enable-profiler --disable-docs --set rust.jemalloc --set llvm.ninja=false"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               USE_XCODE_CLANG: 1
               MACOSX_DEPLOYMENT_TARGET: 11.0

src/bootstrap/dist.rs

@@ -1483,11 +1483,10 @@ impl Step for Extended {
             };
             prepare("rustc");
             prepare("cargo");
-            prepare("rust-docs");
             prepare("rust-std");
             prepare("rust-analysis");
             prepare("clippy");
-            for tool in &["rust-demangler", "rls", "rust-analyzer", "miri"] {
+            for tool in &["rust-docs", "rust-demangler", "rls", "rust-analyzer", "miri"] {
                 if built_tools.contains(tool) {
                     prepare(tool);
                 }

src/ci/github-actions/ci.yml

@@ -496,6 +496,7 @@ jobs:
                 --enable-full-tools
                 --enable-sanitizers
                 --enable-profiler
+                --disable-docs
                 --set rust.jemalloc
                 --set llvm.ninja=false
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1