[PATCH] D17996: Add support for preserve_most/preserve_all calling conventions to the AArch64 backend.

[Roman Levenstein via llvm-commits]

swiftix added a comment.

I addressed the comments in http://reviews.llvm.org/D18016.

- PreserveMost callee-saves X15 now, because the backend can support it in the meantime.
- After a discussion with Tim, I decided to remove preserve_all support for the time being, as it is not really used yet and the set of registers it should callee-save is not quite settled yet.


http://reviews.llvm.org/D17996