PPC: disable failing cctest on AIX temporarily

Change-Id: I8a0081acb9c5eb662bf43eceb52218096eac327c
Reviewed-on: https://chromium-review.googlesource.com/1174560Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#55229}

test/cctest/cctest.status

@@ -383,6 +383,7 @@
   # TODO(ppc): Implement load/store reverse byte instructions
   'test-run-wasm-simd/RunWasmCompiled_SimdLoadStoreLoad': [SKIP],
   'test-run-wasm-simd/RunWasm_SimdLoadStoreLoad': [SKIP],
+  'test-run-wasm-simd/RunWasm_SimdLoadStoreLoad_turbofan': [SKIP],
 
 }],  # 'system == aix or (arch == ppc64 and byteorder == big)'