[PATCH] D128910: [SystemZ] Add support for tune-cpu attribute

[Kai Nacke via Phabricator via llvm-commits]

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clang (like gcc) has the `-mtune=` command line option. This option
adds the `"tune-cpu"` attribute to a function. The intended functionality
is that the scheduling model of that cpu is used. E.g. `-mtune=z15 -march=z14`
generates only instructions supported on z14 but uses the scheduling model
of z15 for it.
This PR adds the infrastructure to support this.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128910

Files:
  llvm/lib/Target/SystemZ/SystemZSubtarget.cpp
  llvm/lib/Target/SystemZ/SystemZSubtarget.h
  llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp

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