[PATCH] aarch64: support target-specific .req assembler directive

[Janne Grunau]

addressed all review comments

http://reviews.llvm.org/D4206

Files:
  lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  test/MC/AArch64/dot-req-case-insensitive.s
  test/MC/AArch64/dot-req-diagnostics.s
  test/MC/AArch64/dot-req.s
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