Try passing arch to vsdownload.py instead

Author: oskirby

taskcluster/kinds/toolchain/vs.yml

@@ -26,12 +26,11 @@ vs-2022-x86_64:
 vs-2022-aarch64:
     description: "MS Visual Studio 2022 (aarch64)"
     worker-type: b-win11-2024h2-arm64
-    worker:
-        env:
-            PROCESSOR_ARCHITECTURE: arm64 # Bug: I think the aarch64 workers set this incorrectly.
     treeherder:
         symbol: TL(vs-2022-aarch64)
         platform: windows/aarch64
     run:
+        arguments:
+            - --host-arch arm64
         toolchain-alias: vs-2022-aarch64
         toolchain-artifact: public/build/visual-studio-2022.zip

taskcluster/scripts/toolchain/download_vs.ps1

@@ -29,7 +29,8 @@ python $env:TASK_WORKDIR\vsdownload.py `
     --accept-license `
     --skip-recommended `
     --msvc-version $MSVC_VERSION `
-    --dest "$env:TASK_WORKDIR\vs2022"
+    --dest "$env:TASK_WORKDIR\vs2022" `
+    @args
 
 # Download additional extensions
 python "$env:VCS_PATH\scripts\windows\fetch-vsix-package.py" --ltsc-version $MSVC_VERSION --output "$env:TASK_WORKDIR\vs2022" $VS_EXTRA_PACKAGES