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Author SHA1 Message Date
Tim Northover
7f8ca02cf4 ARM: implement correct atomic operations on v7M 
ARM v7M has ldrex/strex but not ldrexd/strexd. This means 32-bit
operations should work as normal, but 64-bit ones are almost certainly
doomed.

Patch by Phoebe Buckheister.

llvm-svn: 211042
 2014-06-16 18:49:36 +00:00