[PATCH] Don't store available subtarget features in AArch64SysReg::SysRegMapper.

[Vladimir Sukharev]

Hi jmolloy, echristo,

Based on discussion at http://reviews.llvm.org/D8496.
Unfortunately, that webdiscussion does not contain all messages from email chat. It seems a bug for me.
Long story short: subtarget features must not be a part of the target machine. So, it needs not to be stored in instance, but provided each time fromString/toString are called

It's a follow-up to http://reviews.llvm.org/rL207742

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8655

Files:
  lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
  lib/Target/AArch64/Utils/AArch64BaseInfo.cpp
  lib/Target/AArch64/Utils/AArch64BaseInfo.h

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