[PATCH] [ARM64] Add proper bounds checking/diagnostics to logical shifts

[Bradley Smith]

Hi t.p.northover,

Patch to add proper bounds checking/diagnostics to logical shifts, this also means we can get rid of yet more AsmParser hacks that do this manually.

As with my previous patches, there is no testcase for this as it is part of the merge of MC/AArch64/basic-a64-diagnostics.s.

http://reviews.llvm.org/D3701

Files:
  lib/Target/ARM64/ARM64InstrFormats.td
  lib/Target/ARM64/ARM64InstrInfo.td
  lib/Target/ARM64/AsmParser/ARM64AsmParser.cpp
  test/MC/ARM64/diags.s
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