Pin SYCLOS_Nightly version used

This PR pins specific, last known to work, version of SYCLOS compiler
instead of using the latest nightly build.

Reproducer CMPLRLLVM-49389 has been filed for the compiler team to
investigate.

Author: oleksandr-pavlyk

.github/workflows/os-llvm-sycl-build.yml

@@ -37,34 +37,42 @@ jobs:
             ${{ runner.os }}-
 
       - name: Download and install nightly and components
+        env:
+          USE_LATEST_SYCLOS: 0
         shell: bash -l {0}
         run: |
           cd /home/runner/work
           mkdir -p sycl_bundle
           cd sycl_bundle
-          # get list of shas and tags from remote, filter sycl-nightly tags and reverse order
-          export LLVM_TAGS=$(git -c 'versionsort.suffix=-' ls-remote --tags --sort='v:refname' https://github.com/intel/llvm.git | \
-                       grep sycl-nightly | awk '{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j--] }')
-          # initialize
-          unset DEPLOY_NIGHTLY_TAG
-          unset DEPLOY_NIGHTLY_TAG_SHA
-
-          # go through tags and find the most recent one where nighly build binary is available
-          while IFS= read -r NEXT_LLVM_TAG; do
-              export NEXT_LLVM_TAG_SHA=$(echo ${NEXT_LLVM_TAG} | awk '{print $1}')
-              export NEXT_NIGHTLY_TAG=$(python3 -c "import sys, urllib.parse as ul; print (ul.quote_plus(sys.argv[1]))" \
-                                          $(echo ${NEXT_LLVM_TAG} | awk '{gsub(/^refs\/tags\//, "", $2)} {print $2}'))
-              if [[ `wget -S --spider ${DOWNLOAD_URL_PREFIX}/${NEXT_NIGHTLY_TAG}/dpcpp-compiler.tar.gz  2>&1 | grep 'HTTP/1.1 200 OK'` ]];
-              then
-                  export DEPLOY_NIGHTLY_TAG=${NEXT_NIGHTLY_TAG}
-                  export DEPLOY_LLVM_TAG_SHA=${NEXT_LLVM_TAG_SHA}
-                  break
-              fi
-          done <<< "${LLVM_TAGS}"
+          if [[ -n "${USE_LATEST_SYCLOS:-0}"" ]]; then
+              # get list of shas and tags from remote, filter sycl-nightly tags and reverse order
+              export LLVM_TAGS=$(git -c 'versionsort.suffix=-' ls-remote --tags --sort='v:refname' https://github.com/intel/llvm.git | \
+                          grep sycl-nightly | awk '{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j--] }')
+              # initialize
+              unset DEPLOY_NIGHTLY_TAG
+              unset DEPLOY_NIGHTLY_TAG_SHA
+
+              # go through tags and find the most recent one where nighly build binary is available
+              while IFS= read -r NEXT_LLVM_TAG; do
+                  export NEXT_LLVM_TAG_SHA=$(echo ${NEXT_LLVM_TAG} | awk '{print $1}')
+                  export NEXT_NIGHTLY_TAG=$(python3 -c "import sys, urllib.parse as ul; print (ul.quote_plus(sys.argv[1]))" \
+                                              $(echo ${NEXT_LLVM_TAG} | awk '{gsub(/^refs\/tags\//, "", $2)} {print $2}'))
+                  if [[ `wget -S --spider ${DOWNLOAD_URL_PREFIX}/${NEXT_NIGHTLY_TAG}/dpcpp-compiler.tar.gz  2>&1 | grep 'HTTP/1.1 200 OK'` ]];
+                  then
+                      export DEPLOY_NIGHTLY_TAG=${NEXT_NIGHTLY_TAG}
+                      export DEPLOY_LLVM_TAG_SHA=${NEXT_LLVM_TAG_SHA}
+                      break
+                  fi
+              done <<< "${LLVM_TAGS}"
+          else
+              # Use latest known to work tag instead
+              export DEPLOY_NIGHTLY_TAG="sycl-nightly%2F20230606"
+              export DEPLOY_LLVM_TAG_SHA=f44d0133d4b0077298f034697a1f3818ff1d6134
+          fi
 
           [[ -n "${DEPLOY_NIGHTLY_TAG}" ]] || exit 1
           [[ -n "${DEPLOY_LLVM_TAG_SHA}" ]] || exit 1
-          echo "Using ${m} corresponding to intel/llvm at ${DEPLOY_LLVM_TAG_SHA}"
+          echo "Using ${DEPLOY_NIGHTLY_TAG} corresponding to intel/llvm at ${DEPLOY_LLVM_TAG_SHA}"
 
           if [[ -f bundle_id.txt && ( "$(cat bundle_id.txt)" == "${DEPLOY_LLVM_TAG_SHA}" ) ]]; then
               echo "Using cached download of ${DEPLOY_LLVM_TAG_SHA}"