[AMD] Disable flaky atomic cas test on CDNA2 (#8376)

Also makes the optional gfx90a bots not failing other runners.

Author: antiagainst

.github/workflows/integration-tests-amd.yml

@@ -11,6 +11,7 @@ jobs:
   integration-tests-amd:
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 45
+    continue-on-error: ${{ matrix.runner[1] == 'gfx90a' }}
     strategy:
       matrix:
         runner: ${{ fromJson(inputs.matrix) }}

python/test/unit/language/test_core.py

@@ -1617,6 +1617,8 @@ def kernel(X, SHAPE0: tl.constexpr, SHAPE1: tl.constexpr):
 @pytest.mark.parametrize("num_ctas", num_ctas_list)
 @pytest.mark.parametrize("dtype_str", ["int32", "int64"])
 def test_atomic_cas(sem, num_ctas, dtype_str, device):
+    if is_hip_cdna2():
+        pytest.skip("Disabled due to being flaky on CDNA2")
     # 1. make sure that atomic_cas changes the original value (Lock)
     @triton.jit
     def change_value(Lock, triton_dtype: tl.constexpr):