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

[Bradley Smith]

Fixup potential union related undefined behavior in isAddSubImm. Unfortunately this can't reasonably be done quite as suggested without code duplication since the classifySymbolRef section needs to work for both the Imm and ShiftedImm cases.

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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