[PATCH] ARM IAS: support .movsp

[Saleem Abdulrasool]

Hi logan, asl, rengolin, t.p.northover,

.movsp is an ARM unwinding directive that indicates to the unwinder that a
register contains an offset from the current stack pointer.  If the offset is
unspecified, it defaults to zero.

http://llvm-reviews.chandlerc.com/D2530

Files:
  include/llvm/MC/MCStreamer.h
  lib/Target/ARM/ARMAsmPrinter.cpp
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/MC/ARM/eh-directive-movsp-diagnostics.s
  test/MC/ARM/eh-directive-movsp.s
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