Disable mLIR

Author: tstellar

.github/workflows/release-binaries.yml

@@ -149,6 +149,8 @@ jobs:
           macos-13)
             if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
               build_runs_on="${{ inputs.runs-on }}"
+              # Disable MLIR on pull requests since that will be tested in a different job.
+              target_cmake_flags="$target_cmake_flags -DLLVM_RELEASE_ENABLE_PROJECTS='clang;lld;lldb;clang-tools-extra;polly'"
             else
               build_runs_on="macos-13-large"
             fi