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Author SHA1 Message Date
Jonas Paulsson 82879c2913 [SystemZ] Support the kernel back chain. 
In order to build the Linux kernel, the back chain must be supported with
packed-stack. The back chain is then stored topmost in the register save
area.

Review: Ulrich Weigand

Differential Revision: https://reviews.llvm.org/D74506
 2020-02-23 13:42:36 -08:00
Jonas Paulsson c0f1eac008 [SystemZ] Don't allow CL option -mpacked-stack with -mbackchain. 
-mpacked-stack is currently not supported with -mbackchain, so this should
result in a compilation error message instead of being silently ignored.

Review: Ulrich Weigand
 2020-01-03 12:26:54 -08:00