Auto merge of #112779 - Kobzol:ci-merge-llvm-14, r=pietroalbini

CI: merge x86_64-gnu-llvm-14 and x86_64-gnu-llvm-14-stage1 CI jobs

Another attempt to shorten CI job times. Suggested by `@the8472` [here](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/CI.20usage/near/367172221).

4 files changed, 38 insertions, 71 deletions

diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14-stage1/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14-stage1/Dockerfile
deleted file mode 100644
index d45ef0a7d07..00000000000
--- a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14-stage1/Dockerfile
+++ /dev/null
@@ -1,54 +0,0 @@
-FROM ubuntu:22.04
-
-ARG DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  g++ \
-  gcc-multilib \
-  make \
-  ninja-build \
-  file \
-  curl \
-  ca-certificates \
-  python3 \
-  git \
-  cmake \
-  sudo \
-  gdb \
-  llvm-14-tools \
-  llvm-14-dev \
-  libedit-dev \
-  libssl-dev \
-  pkg-config \
-  zlib1g-dev \
-  xz-utils \
-  nodejs \
-  mingw-w64 \
-  && rm -rf /var/lib/apt/lists/*
-
-COPY scripts/sccache.sh /scripts/
-RUN sh /scripts/sccache.sh
-
-# We are disabling CI LLVM since this builder is intentionally using a host
-# LLVM, rather than the typical src/llvm-project LLVM.
-ENV NO_DOWNLOAD_CI_LLVM 1
-
-# This is not the latest LLVM version, so some components required by tests may
-# be missing.
-ENV IS_NOT_LATEST_LLVM 1
-
-# Using llvm-link-shared due to libffi issues -- see #34486
-ENV RUST_CONFIGURE_ARGS \
-      --build=x86_64-unknown-linux-gnu \
-      --llvm-root=/usr/lib/llvm-14 \
-      --enable-llvm-link-shared \
-      --set rust.thin-lto-import-instr-limit=10
-
-ENV SCRIPT ../x.py --stage 1 test --exclude src/tools/tidy && \
-           # Run the `mir-opt` tests again but this time for a 32-bit target.
-           # This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
-           # both 32-bit and 64-bit outputs updated by the PR author, before
-           # the PR is approved and tested for merging.
-           # It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
-           # despite having different output on 32-bit vs 64-bit targets.
-           ../x.py --stage 1 test tests/mir-opt \
-                             --host='' --target=i686-unknown-linux-gnu
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
index 1f28b939778..93d18bcf1b1 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/Dockerfile
@@ -49,20 +49,6 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
-# NOTE: intentionally uses all of `x.py`, `x`, and `x.ps1` to make sure they all work on Linux.
-ENV SCRIPT ../x.py --stage 2 test --exclude src/tools/tidy && \
-           # Run the `mir-opt` tests again but this time for a 32-bit target.
-           # This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
-           # both 32-bit and 64-bit outputs updated by the PR author, before
-           # the PR is approved and tested for merging.
-           # It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
-           # despite having different output on 32-bit vs 64-bit targets.
-           ../x --stage 2 test tests/mir-opt \
-                             --host='' --target=i686-unknown-linux-gnu && \
-           # Run the UI test suite again, but in `--pass=check` mode
-           #
-           # This is intended to make sure that both `--pass=check` continues to
-           # work.
-           #
-           ../x.ps1 --stage 2 test tests/ui --pass=check \
-                             --host='' --target=i686-unknown-linux-gnu
+COPY host-x86_64/x86_64-gnu-llvm-14/script.sh /tmp/
+
+ENV SCRIPT /tmp/script.sh
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/script.sh b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/script.sh
new file mode 100755
index 00000000000..0120fd98298
--- /dev/null
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-14/script.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+set -ex
+
+# Only run the stage 1 tests on merges, not on PR CI jobs.
+if [[ -z "${PR_CI_JOB}" ]]; then
+../x.py --stage 1 test --exclude src/tools/tidy && \
+           # Run the `mir-opt` tests again but this time for a 32-bit target.
+           # This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
+           # both 32-bit and 64-bit outputs updated by the PR author, before
+           # the PR is approved and tested for merging.
+           # It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
+           # despite having different output on 32-bit vs 64-bit targets.
+           ../x.py --stage 1 test tests/mir-opt \
+                             --host='' --target=i686-unknown-linux-gnu
+fi
+
+# NOTE: intentionally uses all of `x.py`, `x`, and `x.ps1` to make sure they all work on Linux.
+../x.py --stage 2 test --exclude src/tools/tidy && \
+     # Run the `mir-opt` tests again but this time for a 32-bit target.
+     # This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
+     # both 32-bit and 64-bit outputs updated by the PR author, before
+     # the PR is approved and tested for merging.
+     # It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
+     # despite having different output on 32-bit vs 64-bit targets.
+     ../x --stage 2 test tests/mir-opt \
+                       --host='' --target=i686-unknown-linux-gnu && \
+     # Run the UI test suite again, but in `--pass=check` mode
+     #
+     # This is intended to make sure that both `--pass=check` continues to
+     # work.
+     #
+     ../x.ps1 --stage 2 test tests/ui --pass=check \
+                       --host='' --target=i686-unknown-linux-gnu
diff --git a/src/ci/docker/run.sh b/src/ci/docker/run.sh
index 0a098467d94..4b218d57727 100755
--- a/src/ci/docker/run.sh
+++ b/src/ci/docker/run.sh
@@ -263,6 +263,7 @@ docker \
   --env CI_JOB_NAME="${CI_JOB_NAME-$IMAGE}" \
   --env BASE_COMMIT="$BASE_COMMIT" \
   --env DIST_TRY_BUILD \
+  --env PR_CI_JOB \
   --init \
   --rm \
   rust-ci \