Distribute rustc_codegen_cranelift for Windows

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
 |AIX|❌[^xcoff]|N/A|N/A|❌[^xcoff]|
 |Other unixes|❓|❓|❓|❓|
 |macOS|✅|✅|N/A|N/A|
-|Windows|✅[^no-rustup]|❌|N/A|N/A|
+|Windows|✅|❌|N/A|N/A|
 
 ✅: Fully supported and tested
 ❓: Maybe supported, not tested

src/bootstrap/src/core/build_steps/dist.rs

@@ -1361,18 +1361,9 @@ impl Step for CodegenBackend {
             return None;
         }
 
-        if self.backend == "cranelift" {
-            if !target_supports_cranelift_backend(self.compiler.host) {
-                builder.info("target not supported by rustc_codegen_cranelift. skipping");
-                return None;
-            }
-
-            if self.compiler.host.is_windows() {
-                builder.info(
-                    "dist currently disabled for windows by rustc_codegen_cranelift. skipping",
-                );
-                return None;
-            }
+        if self.backend == "cranelift" && !target_supports_cranelift_backend(self.compiler.host) {
+            builder.info("target not supported by rustc_codegen_cranelift. skipping");
+            return None;
         }
 
         let compiler = self.compiler;

src/ci/github-actions/jobs.yml

@@ -416,6 +416,7 @@ auto:
         --set rust.codegen-units=1
       SCRIPT: python x.py build --set rust.debug=true opt-dist && PGO_HOST=x86_64-pc-windows-msvc ./build/x86_64-pc-windows-msvc/stage0-tools-bin/opt-dist windows-ci -- python x.py dist bootstrap --include-default-paths
       DIST_REQUIRE_ALL_TOOLS: 1
+      CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-windows-8c
 
   - image: dist-i686-msvc
@@ -428,6 +429,7 @@ auto:
         --enable-profiler
       SCRIPT: python x.py dist bootstrap --include-default-paths
       DIST_REQUIRE_ALL_TOOLS: 1
+      CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-windows-8c
 
   - image: dist-aarch64-msvc
@@ -452,6 +454,7 @@ auto:
       NO_DOWNLOAD_CI_LLVM: 1
       SCRIPT: python x.py dist bootstrap --include-default-paths
       DIST_REQUIRE_ALL_TOOLS: 1
+      CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-windows-8c
 
   - image: dist-x86_64-mingw
@@ -464,6 +467,7 @@ auto:
       # incompatible with LLVM downloads today).
       NO_DOWNLOAD_CI_LLVM: 1
       DIST_REQUIRE_ALL_TOOLS: 1
+      CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-windows-8c
 
   - image: dist-x86_64-msvc-alt