Add release tarballs for libclc

Fixes PR47917.

Reviewed By: tstellar

Differential Revision: https://reviews.llvm.org/D90100

(cherry picked from commit 139785d)

Author: aaronpuchert

llvm/utils/release/export.sh

@@ -13,7 +13,7 @@
 
 set -e
 
-projects="llvm clang test-suite compiler-rt libcxx libcxxabi clang-tools-extra polly lldb lld openmp libunwind flang"
+projects="llvm clang test-suite compiler-rt libcxx libcxxabi libclc clang-tools-extra polly lldb lld openmp libunwind flang"
 
 release=""
 rc=""