[llvm] [CI] Download lit timing files (PR #160138)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/160138

This patch downloads the lit timing files from our GCS bucket into the local directory so that lit can execute them in a smarter order (biggest first to take advantage of parallelism).

>From 870e49cd46e94e1fc775f7145a87f7cc7a7be2c0 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Mon, 22 Sep 2025 16:00:04 +0000
Subject: [PATCH] [CI] Download lit timing files

This patch downloads the lit timing files from our GCS bucket into the
local directory so that lit can execute them in a smarter order (biggest
first to take advantage of parallelism).
---
 .github/workflows/premerge.yaml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/premerge.yaml b/.github/workflows/premerge.yaml
index 63ab4a8356971..ec96ccb86a86c 100644
--- a/.github/workflows/premerge.yaml
+++ b/.github/workflows/premerge.yaml
@@ -68,6 +68,7 @@ jobs:
           mkdir artifacts
           SCCACHE_LOG=info SCCACHE_ERROR_LOG=$(pwd)/artifacts/sccache.log sccache --start-server
 
+          python .ci/cache_lit_timing_files.py download
           ./.ci/monolithic-linux.sh "${projects_to_build}" "${project_check_targets}" "${runtimes_to_build}" "${runtimes_check_targets}" "${runtimes_check_targets_needs_reconfig}" "${enable_cir}"
       - name: Upload Artifacts
         # In some cases, Github will fail to upload the artifact. We want to
@@ -122,7 +123,7 @@ jobs:
           call C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64
           # See the comments above in the Linux job for why we define each of
           # these environment variables.
-          bash -c "export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET; export SCCACHE_GCS_RW_MODE=READ_WRITE; export SCCACHE_IDLE_TIMEOUT=0; mkdir artifacts; SCCACHE_LOG=info SCCACHE_ERROR_LOG=$(pwd)/artifacts/sccache.log sccache --start-server; .ci/monolithic-windows.sh \"${{ steps.vars.outputs.windows-projects }}\" \"${{ steps.vars.outputs.windows-check-targets }}\" \"${{ steps.vars.outputs.windows-runtimes }}\" \"${{ steps.vars.outputs.windows-runtimes-check-targets }}\""
+          bash -c "export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET; export SCCACHE_GCS_RW_MODE=READ_WRITE; export SCCACHE_IDLE_TIMEOUT=0; mkdir artifacts; SCCACHE_LOG=info SCCACHE_ERROR_LOG=$(pwd)/artifacts/sccache.log sccache --start-server; python .ci/cache_lit_timing_files.py download; .ci/monolithic-windows.sh \"${{ steps.vars.outputs.windows-projects }}\" \"${{ steps.vars.outputs.windows-check-targets }}\" \"${{ steps.vars.outputs.windows-runtimes }}\" \"${{ steps.vars.outputs.windows-runtimes-check-targets }}\""
       - name: Upload Artifacts
         # In some cases, Github will fail to upload the artifact. We want to
         # continue anyways as a failed artifact upload is an infra failure, not