[PATCH] [ARM64] Parse fixed vector lanes properly so that diagnostics can be emitted

[Bradley Smith]

Hi t.p.northover,

This patch adds proper parsing for fixed vector lanes such as '[1]' rather than hardcoding it in the asm string. This allows for better diagnostics as well as cleaning up some hacks.

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/D3782

Files:
  lib/Target/ARM64/ARM64InstrFormats.td
  lib/Target/ARM64/AsmParser/ARM64AsmParser.cpp
  lib/Target/ARM64/Disassembler/ARM64Disassembler.cpp
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