Restore Frontier AMD bench entry

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/workflows/bench.yml

@@ -74,15 +74,14 @@ jobs:
             device: gpu
             interface: omp
             build_script: "bash .github/workflows/frontier/build.sh gpu omp bench"
-          # frontier_amd bench disabled: IBM case hits zero-size GPU transfer bug with AMD OpenMP offloading
-          # - cluster: frontier_amd
-          #   name: Oak Ridge | Frontier (AMD)
-          #   group: phoenix
-          #   labels: frontier
-          #   flag: famd
-          #   device: gpu
-          #   interface: omp
-          #   build_script: "bash .github/workflows/frontier_amd/build.sh gpu omp bench"
+          - cluster: frontier_amd
+            name: Oak Ridge | Frontier (AMD)
+            group: phoenix
+            labels: frontier
+            flag: famd
+            device: gpu
+            interface: omp
+            build_script: "bash .github/workflows/frontier_amd/build.sh gpu omp bench"
     runs-on:
       group: ${{ matrix.group }}
       labels: ${{ matrix.labels }}