[PATCH] [ARM64] Re-work parsing of ADD/SUB shifted immediate operands

[Bradley Smith]

New patch that removes the incorrect use of ARM64_AM shift encodings in isAddSubImm and tightens up the shift parsing in tryParseAddSubImm to disallow garbage shifts. As for simplifying tryParseAddSubImm, I'm not convinced that only allowing 12/0 there is going to actually simplify anything, but rather just move code from isAddSubImm.

http://reviews.llvm.org/D3665

Files:
  lib/Target/ARM64/ARM64InstrFormats.td
  lib/Target/ARM64/ARM64InstrInfo.td
  lib/Target/ARM64/AsmParser/ARM64AsmParser.cpp
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