Rollup merge of #149507 - mati865:windows-gnu-like-no-asserts, r=clubby789

Mark windows-gnu* as lacking build with assertions

Knowing that `x86_64-pc-windows-gnu` has no builds with assertions, I have just copied it as `x86_64-pc-windows-gnullvm` and called a day. Obviously it should have been `false`, sorry for that.
While at it, also fix `x86_64-pc-windows-gnu`.

src/bootstrap/src/core/build_steps/llvm.rs

@@ -210,7 +210,7 @@ pub(crate) fn is_ci_llvm_available_for_target(
         ("i686-unknown-linux-gnu", false),
         ("x86_64-unknown-linux-gnu", true),
         ("x86_64-apple-darwin", true),
-        ("x86_64-pc-windows-gnu", true),
+        ("x86_64-pc-windows-gnu", false),
         ("x86_64-pc-windows-msvc", true),
         // tier 2 with host tools
         ("aarch64-unknown-linux-musl", false),
@@ -227,7 +227,7 @@ pub(crate) fn is_ci_llvm_available_for_target(
         ("powerpc64le-unknown-linux-musl", false),
         ("riscv64gc-unknown-linux-gnu", false),
         ("s390x-unknown-linux-gnu", false),
-        ("x86_64-pc-windows-gnullvm", true),
+        ("x86_64-pc-windows-gnullvm", false),
         ("x86_64-unknown-freebsd", false),
         ("x86_64-unknown-illumos", false),
         ("x86_64-unknown-linux-musl", false),

src/ci/github-actions/jobs.yml

@@ -612,16 +612,12 @@ auto:
     env:
       SCRIPT: make ci-mingw-x
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu
-      # There is no dist-x86_64-mingw-alt, so there is no prebuilt LLVM with assertions
-      NO_DOWNLOAD_CI_LLVM: 1
     <<: *job-windows
 
   - name: x86_64-mingw-2
     env:
       SCRIPT: make ci-mingw-bootstrap
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu
-      # There is no dist-x86_64-mingw-alt, so there is no prebuilt LLVM with assertions
-      NO_DOWNLOAD_CI_LLVM: 1
     <<: *job-windows
 
   - name: dist-x86_64-msvc