add to full test-suite

Author: Milo123459

.github/workflows/ci.yml

@@ -281,6 +281,10 @@ jobs:
             env:
               RUST_BACKTRACE: 1
             os: ubuntu-20.04-xl
+          - name: x86_64-gnu-llvm-12-stage1
+            env:
+              RUST_BACKTRACE: 1
+            os: ubuntu-20.04-xl
           - name: x86_64-gnu-nopt
             os: ubuntu-20.04-xl
             env: {}

src/ci/github-actions/ci.yml

@@ -439,6 +439,11 @@ jobs:
               RUST_BACKTRACE: 1
             <<: *job-linux-xl
 
+          - name: x86_64-gnu-llvm-12-stage1
+            env:
+              RUST_BACKTRACE: 1
+            <<: *job-linux-xl
+
           - name: x86_64-gnu-nopt
             <<: *job-linux-xl