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Add memory synchronization semantics to LSE Atomics. The memory semantics feature will be added in a subsequent patch. In this patch, several corrections were added to the existing LSE Atomics implementation, based on the ARM Errata D11904 from 05/12/2017. Patch by: steleman Differential Revision: https://reviews.llvm.org/D35319 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310167 91177308-0d34-0410-b5e6-96231b3b80d8