PPC/s390: ignore wasm/regress-808980 on ppc and s390

wasm code manager is known to have issue on reloc tagging and
also constant pool. Ignore until fix go in.

Change-Id: I4d7ddafba3cf8bc81c73a7b156cba39985bce48d
Reviewed-on: https://chromium-review.googlesource.com/906950Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#51160}

test/mjsunit/mjsunit.status

@@ -724,8 +724,9 @@
   # TODO(ppc/s390): implement atomic operations
   'wasm/atomics': [SKIP],
   'wasm/shared-memory': [SKIP],
-  # TODO(ppc/s390): fix constant pool issue and use implement tagging
+  # TODO(ppc/s390): fix constant pool issue and implement tagging for reloc
   'wasm/compiled-module-serialization': [SKIP],
+  'regress/wasm/regress-808980': [SKIP],
 }],  # 'arch == ppc64 or arch == ppc or arch == s390 or arch == s390x'
 
 ##############################################################################