[PATCH] [AArch64] Refactor AArch64NamedImmMapper to become dependent on subtarget features.

[Vladimir Sukharev]

Eric, thank you for your feedback
in fact, I have already committed that as http://reviews.llvm.org/rL235089, with slight re-work, addressing last jmolloy's comment
I suspect a line of text after "Differential Revision:" line has prevented post-commit script to process auto-closing this DiffRevision properly. And I don't know at the time how should I fix that: close Revision and put links to commit and back. (Is it a way to do that at all?)
Anyway, should I address your comments as a separate follow-up patch? If so, would you please comment directly to http://reviews.llvm.org/rL235089, because things are changed a bit.


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