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This is a follow-up to:
https://codereview.chromium.org/22240002/
And requires the Clang changes from:
https://codereview.chromium.org/22294002/
This new intrinsic represents ``asm("":::"~{memory}")`` as well as ``__sync_synchronize()``, and in IR it corresponds to a sequentially-consistent fence surrounded by ``call void asm sideeffect "", "~{memory}"()``.
R=jvoung@chromium.org
TEST= ninja check-all
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3475
Review URL: https://codereview.chromium.org/22474008
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