Bug fix 12730: Add support for __GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4,8} on ARM

[weimingz at codeaurora.org]

Hi,

The orignal patch (r178816) fixed bug 12730 for x86. This patch adds the
same macro definitions "__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4,8}" to ARM
target to address the same issue.

Please help to review it.

Thanks


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