Auto merge of rust-lang#135813 - marcoieni:free-runner-i686-mingw, r=<try>

CI: split i686-mingw job to two free runners

try-job: i686-mingw-1
try-job: i686-mingw-2

Author: bors

src/ci/github-actions/jobs.yml

@@ -446,6 +446,7 @@ auto:
   #  Windows Builders  #
   ######################
 
+  # x86_64-msvc is split into two jobs to run tests in parallel.
   - name: x86_64-msvc-1
     env:
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --enable-profiler
@@ -517,14 +518,24 @@ auto:
   # came from the mingw-w64 SourceForge download site. Unfortunately
   # SourceForge is notoriously flaky, so we mirror it on our own infrastructure.
 
-  - name: i686-mingw
+  # i686-mingw is split into two jobs to run tests in parallel.
+  - name: i686-mingw-1
     env:
       RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
-      SCRIPT: make ci-mingw
+      SCRIPT: make ci-mingw-x
       # We are intentionally allowing an old toolchain on this builder (and that's
       # incompatible with LLVM downloads today).
       NO_DOWNLOAD_CI_LLVM: 1
-    <<: *job-windows-8c
+    <<: *job-windows-25
+
+  - name: i686-mingw-2
+    env:
+      RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
+      SCRIPT: make ci-mingw-bootstrap
+      # We are intentionally allowing an old toolchain on this builder (and that's
+      # incompatible with LLVM downloads today).
+      NO_DOWNLOAD_CI_LLVM: 1
+    <<: *job-windows-25
 
   # x86_64-mingw is split into two jobs to run tests in parallel.
   - name: x86_64-mingw-1