[PATCH] [ARM64] Check for proper immediate in shift/extend operands

[Bradley Smith]

Hi t.p.northover,

This fixes an assertion failure when using a negative immediate after a shift or extend operand.

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/D3663

Files:
  lib/Target/ARM64/AsmParser/ARM64AsmParser.cpp
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