Add cctest/test-run-wasm-64/Run_WasmInt64* to skip list for big-endian

Newly added tests cause failures on 32-bit bigendian and are skipped
until a solution is found.

R=titzer@chromium.org, ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1761573002

Cr-Commit-Position: refs/heads/master@{#34447}

test/cctest/cctest.status

@@ -284,6 +284,7 @@
   'test-run-wasm-js/Run_JSSelect_4': [SKIP],
   'test-run-wasm-js/Run_JSSelect_5': [SKIP],
   'test-run-wasm-js/Run_JSSelect_6': [SKIP],
+  'test-run-wasm-64/Run_WasmI64*': [SKIP],
 }],  # 'byteorder == big'
 
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