[CI] Add csmith

.github/workflows/weekly_csmith.yml

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+name: weekly-csmith
+
+on:
+  schedule:
+    - cron: '20 05 * * 2'
+
+jobs:
+  run_csmith:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Get deps
+        run: sudo apt-get update && apt-get install -y --no-install-recommends clang csmith libcsmith-dev
+      - name: Build
+        run: clang -Wno-switch *.c -O3 -flto=auto -march=native -fsanitize=address -o slimcc_asan
+      - name: Run csmith
+        run: |
+          export ASAN_OPTIONS=detect_leaks=0
+          mkdir csmith_run && cd "$_"
+          bash ../scripts/run_csmith.bash $PWD/../slimcc_asan

scripts/run_csmith.bash

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+REFCC=clang
+
+TSTCC=$1
+
+EPOCH=$(date +"%s")
+
+MAX_JOBS=4
+
+csmith -v
+
+for ((seed = EPOCH; seed <= $((EPOCH + 605000)); seed++)); do
+    if (( $(jobs -r -p | wc -l) >= MAX_JOBS )); then
+        wait -n
+    fi
+  (
+    if (( (seed % 5000) == 0 )); then
+        echo "heartbeat:"$seed
+    fi
+
+    mkdir -p $seed
+
+    csmith --no-packed-struct --seed $seed > $seed/main.c
+
+    cd $seed
+
+    $REFCC main.c -I /usr/include/csmith -lm -o ref.exe 2>/dev/null
+
+    timeout 1 ./ref.exe > ref.txt
+    if (( $? != 0 )); then
+      cd ../ && rm -r $seed
+      exit
+    fi
+
+    $TSTCC main.c -I /usr/include/csmith -lm -o tst.exe
+    if (( $? != 0 )); then
+      echo "tst cc failed at:"$seed
+      touch ../has_error
+      cd ../ && rm -r $seed
+      exit
+    fi
+
+    timeout 10 ./tst.exe > tst.txt
+
+    cmp -s ref.txt tst.txt
+    if (( $? != 0 )); then
+      echo "differ at:"$seed
+      touch ../has_error
+    fi
+
+    cd ../ && rm -r $seed
+  ) &
+done
+
+wait
+
+if test -f ./has_error; then
+  rm ./has_error
+  exit 1
+fi