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* Basic codegen for MTE stack tagging.Evgeniy Stepanov2019-07-171-0/+42
Implement IR intrinsics for stack tagging. Generated code is very unoptimized for now. Two special intrinsics, llvm.aarch64.irg.sp and llvm.aarch64.tagp are used to implement a tagged stack frame pointer in a virtual register. Differential Revision: https://reviews.llvm.org/D64172 llvm-svn: 366360
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