[ci] Revert LLVM to 14.0.0 ubuntu-18.04 tarball

14.0.6 does not ship an ubuntu-22.04 tarball (404). No LLVM 14.x release
does. Use 14.0.0 with the ubuntu-18.04 tarball, which is glibc
backwards-compatible and works on Ubuntu 22.04.

Topic: ubuntu-22-04-test
Labels: draft

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: andrew <andrew@anyscale.com>

Author: andrew-anyscale

ci/env/install-llvm-binaries.sh

@@ -25,13 +25,13 @@ log_err() {
 
 trap '[ $? -eq 0 ] || log_err' EXIT
 
-FILE_NAME="clang+llvm-14.0.6-x86_64-linux-gnu-ubuntu-22.04.tar.xz"
+FILE_NAME="clang+llvm-14.0.0-x86_64-linux-gnu-ubuntu-18.04.tar.xz"
 
 if [ "$HOSTTYPE" = "aarch64" ]; then
-  FILE_NAME="clang+llvm-14.0.6-aarch64-linux-gnu.tar.xz"
+  FILE_NAME="clang+llvm-14.0.0-aarch64-linux-gnu.tar.xz"
 fi
 
-LLVM_URL="https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.6/${FILE_NAME}"
+LLVM_URL="https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/${FILE_NAME}"
 
 TARGET_DIR="/opt/llvm"