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Author SHA1 Message Date
Oliver Stannard 5f34e9e265 [ARM][v8.5A] Add speculation barriers SSBB and PSSBB 
This adds two new barrier instructions which can be used to restrict
speculative execution of load instructions.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52484

llvm-svn: 343300
 2018-09-28 08:27:56 +00:00