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This introduces a SystemZ-specific "backchain" attribute on function, which enables writing the frame backchain link as specified by the ABI. This will be used to implement -mbackchain option in clang. Differential Revision: http://reviews.llvm.org/D19889 Fixed in this version: added RegState::Define and RegState::Kill on R1D in prologue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268581 91177308-0d34-0410-b5e6-96231b3b80d8
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