Dimitry Andric 462386c6b1 Pull in r148240 from upstream llvm trunk:
Make sure the non-SSE lowering for fences correctly clobbers EFLAGS.
  PR11768.

In particular, this fixes segfaults during the build of devel/icu on
i386.  The __sync_synchronize() builtin used for implementing icu's
internal barrier could lead to incorrect behaviour.

MFC after:	3 days
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