workflows: Fix tarball download for libclang-abi-tests

Author: tstellar

.github/workflows/libclang-abi-tests.yml

@@ -41,7 +41,7 @@ jobs:
           remote_repo='https://github.com/llvm/llvm-project'
           if [ ${{ steps.version.outputs.LLVM_VERSION_MINOR }} -ne 0 -o ${{ steps.version.outputs.LLVM_VERSION_PATCH }} -eq 0 ]; then
             major_version=$(( ${{ steps.version.outputs.LLVM_VERSION_MAJOR }} - 1))
-            baseline_ref="$major_version.0.0"
+            baseline_ref="llvmorg-$major_version.0.0"
 
             # If there is a minor release, we want to use that as the base line.
             minor_ref=`git ls-remote --refs -t $remote_repo llvmorg-$major_version.[1-9].[0-9] | tail -n1 | grep -o 'llvmorg-.\+' || true`
@@ -60,7 +60,7 @@ jobs:
             echo ::set-output name=ABI_LIBS::libclang.so
           else
             echo ::set-output name=BASELINE_VERSION_MAJOR::${{ steps.version.outputs.LLVM_VERSION_MAJOR }}
-            echo ::set-output name=BASELINE_REF::${{ steps.version.outputs.LLVM_VERSION_MAJOR }}.0.0
+            echo ::set-output name=BASELINE_REF::llvmorg-${{ steps.version.outputs.LLVM_VERSION_MAJOR }}.0.0
             echo ::set-output name=ABI_HEADERS::.
             echo ::set-output name=ABI_LIBS::libclang.so libclang-cpp.so
           fi