[PATCH] [ARM64] Add diagnostics for expected arithmetic shifts

[Bradley Smith]

Hi t.p.northover,

This change adds proper diagnostics for expected arithmetic shifts.

There is no testcase for this fix since it is part of porting over MC/AArch64/basic-a64-diagnostics.s, which will be enabled for ARM64 once everything is fixed in it.

http://reviews.llvm.org/D3666

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