Marcin Koscielnicki ad1482c6f1 [SystemZ] Implement backchain attribute (recommit with fix). ...

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.

llvm-svn: 268581

2016-05-05 00:37:30 +00:00

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