MIPS: Skip embenchen tests on big-endian.

Emscripten requires little-endian arch. It has assertion for endianness:

assert(HEAPU8[0] === 255 && HEAPU8[3] === 0,
    'Typed arrays 2 must be run on a little-endian system');

TEST=mjsunit/asm/embenchen/*
BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/708663003

Patch from Paul Lind <paul.lind@imgtec.com>.

Cr-Commit-Position: refs/heads/master@{#25177}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25177 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit.status

@@ -439,6 +439,9 @@
 ['arch == mips', {
   # Flaky with TF.
   'mirror-script': [PASS, NO_VARIANTS],
+
+  # Emscripten requires little-endian, skip all tests on MIPS EB.
+  'asm/embenchen/*': [SKIP],
 }],  # 'arch == mips'
 
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