[PATCH] [ARM64] Fix the misleading diagnostic on bad extend amount of reg+reg addressing mode.

[Kevin Qin]

Hi grosbach, t.p.northover,

Hi Tim and Jim,

This patch is going to fix Bug 19502 (http://llvm.org/bugs/show_bug.cgi?id=19502). As comments described, I can't simply adding new diagnostic to asmoperand, so I implemented this in C code by a "hack" way. It's the best solution I can image without refactoring whole load/store implementation. Please review, thanks.

http://reviews.llvm.org/D3662

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