[WIP] i686-mingw as try

Author: mati865

.github/workflows/ci.yml

@@ -579,10 +579,13 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: dist-x86_64-linux
+          - name: i686-mingw
             env:
-              CODEGEN_BACKENDS: "llvm,cranelift"
-            os: ubuntu-20.04-16core-64gb
+              RUST_CONFIGURE_ARGS: "--build=i686-pc-windows-gnu"
+              SCRIPT: make ci-mingw
+              NO_DOWNLOAD_CI_LLVM: 1
+              CUSTOM_MINGW: 1
+            os: windows-2019-8core-32gb
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:

src/ci/github-actions/ci.yml

@@ -732,12 +732,15 @@ jobs:
     strategy:
       matrix:
         include:
-          - &dist-x86_64-linux
-            name: dist-x86_64-linux
+          - name: i686-mingw
             env:
-              CODEGEN_BACKENDS: llvm,cranelift
-            <<: *job-linux-16c
-
+              RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
+              SCRIPT: make ci-mingw
+              # We are intentionally allowing an old toolchain on this builder (and that's
+              # incompatible with LLVM downloads today).
+              NO_DOWNLOAD_CI_LLVM: 1
+              CUSTOM_MINGW: 1
+            <<: *job-windows-8c
 
   master:
     name: master