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Author SHA1 Message Date
Robert Lytton 61d9149c73 Add XCore support for ATOMIC_FENCE. 
ATOMIC_FENCE is lowered to a compiler barrier which is codegen only. There
is no need to emit an instructions since the XCore provides sequential
consistency.

Original patch by Richard Osborne

llvm-svn: 194464
 2013-11-12 10:11:26 +00:00