Disable Bytecodes.DecodeBytecodeAndOperands for big-endian.

Because the operands in this test are encoded in little endian format.
Therefore, their bytes are all swapped when reading them on big endian machine.

R=mbrandy@us.ibm.com,joransiu@ca.ibm.com,titzer@chromium.org,machenbach@chromium.org,bradnelson@chromium.org,ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1858793002

Cr-Commit-Position: refs/heads/master@{#35262}

test/unittests/unittests.status

@@ -11,5 +11,6 @@
   'WasmDecoderTest.AllLoadMemCombinations': [SKIP],
   'AstDecoderTest.AllLoadMemCombinations': [SKIP],
   'AstDecoderTest.AllStoreMemCombinations': [SKIP],
+  'Bytecodes.DecodeBytecodeAndOperands': [SKIP],
 }],  # 'byteorder == big'
 ]