Skip WASM atomic tests on big-endian machines.

There is no support to emulate atomic WASM operations on big-endian
platforms, since this would require bit swapping as a part of atomic
operations. Therefore, cctest/test-run-wasm-atomics/* will be skipped.

TEST=cctest/test-run-wasm-atomics/*
BUG=

Change-Id: I1a8b085f816f615011788092e6fc8a8390678382
Reviewed-on: https://chromium-review.googlesource.com/671010Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#48093}

test/cctest/cctest.status

@@ -197,6 +197,15 @@
   'test-serialize/*': [SKIP],
 }],  # 'no_snap == True and system == windows'
 
+##############################################################################
+['byteorder == big', {
+  # Skip WASM atomic tests on big-endian machines.
+  # There is no support to emulate atomic WASM operations on big-endian
+  # platforms, since this would require bit swapping as a part of atomic
+  # operations.
+  'test-run-wasm-atomics/*': [SKIP],
+}],  # 'byteorder == big'
+
 ##############################################################################
 ['system == windows', {