Auto merge of #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
try-job: i686-mingw-3

src/bootstrap/mk/Makefile.in

@@ -99,27 +99,31 @@ prepare:
 
 # Set of tests that represent around half of the time of the test suite.
 # Used to split tests across multiple CI runners.
-STAGE_2_TEST_SET1 := test --stage 2 --skip=compiler --skip=src
-STAGE_2_TEST_SET2 := test --stage 2 --skip=tests --skip=coverage-map --skip=coverage-run --skip=library --skip=tidyselftest
+TEST_SET1 := --skip=compiler --skip=src
+TEST_SET2 := --skip=tests --skip=coverage-map --skip=coverage-run --skip=library --skip=tidyselftest
 
 ## MSVC native builders
 
 # this intentionally doesn't use `$(BOOTSTRAP)` so we can test the shebang on Windows
 ci-msvc-py:
-	$(Q)$(CFG_SRC_DIR)/x.py $(STAGE_2_TEST_SET1)
+	$(Q)$(CFG_SRC_DIR)/x.py test --stage 2 $(TEST_SET1)
 ci-msvc-ps1:
-	$(Q)$(CFG_SRC_DIR)/x.ps1 $(STAGE_2_TEST_SET2)
+	$(Q)$(CFG_SRC_DIR)/x.ps1 test --stage 2 $(TEST_SET2)
 ci-msvc: ci-msvc-py ci-msvc-ps1
 
 ## MingW native builders
 
 # Set of tests that should represent half of the time of the test suite.
 # Used to split tests across multiple CI runners.
 # Test both x and bootstrap entrypoints.
+ci-mingw-x-1:
+	$(Q)$(CFG_SRC_DIR)/x test --stage 2 --skip=compiler $(TEST_SET2)
+ci-mingw-x-2:
+	$(Q)$(CFG_SRC_DIR)/x test --stage 2 --skip=src $(TEST_SET2)
 ci-mingw-x:
-	$(Q)$(CFG_SRC_DIR)/x $(STAGE_2_TEST_SET1)
+	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(TEST_SET1)
 ci-mingw-bootstrap:
-	$(Q)$(BOOTSTRAP) $(STAGE_2_TEST_SET2)
+	$(Q)$(BOOTSTRAP) test --stage 2 $(TEST_SET2)
 ci-mingw: ci-mingw-x ci-mingw-bootstrap
 
 .PHONY: dist

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 +518,33 @@ 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-1
       # 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-x-2
+      # 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
+
+  - name: i686-mingw-3
+    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