[PATCH] D46232: [SystemZ, IPRA] determineCalleeSaves must always add return register and DP.

[Ulrich Weigand via Phabricator via llvm-commits]

uweigand added a comment.

So, in effect, never do the IPRA callee-saved optimization for https://reviews.llvm.org/source/libunwind/, because the caller *could* use it as frame pointer?   That's certainly the conservative solution.

In fact, we're then bascially back to Jonas' original patch anyway.


https://reviews.llvm.org/D46232