Disable mlir/test/mlir-cpu-runner/async-group.mlir with ASAN

This test is crashing 9 out of 10 runs in CI, but I can't reproduce
locally right now. Disabling to get the CI back to green and avoid
backsliding with more ASAN issues that would go unnoticed.

mlir/test/mlir-cpu-runner/async-group.mlir

@@ -11,6 +11,13 @@
 // RUN:     -shared-libs=%linalg_test_lib_dir/libmlir_async_runtime%shlibext   \
 // RUN: | FileCheck %s
 
+// This is crashing in CI "most of the time" on a AMD Rome CPU VM on GCP with:
+//    Tracer caught signal 11: addr=0x7a800028 pc=0x2e81ba sp=0x7efd2a7ffd50
+//    LeakSanitizer has encountered a fatal error.
+// This is hard to reproduce locally unfortunately. Disable it with ASAN/LSAN
+// to keep the bot green for now.
+// UNSUPPORTED: asan
+
 func @main() {
   %c1 = constant 1 : index
   %c5 = constant 5 : index