[PATCH] [ARMv8] Implement the SEVL hint instruction

[Joey Gouly]

Hi t.p.northover,

This adds an extra hint instruction SEVL (send local event).

I had to modify the current hint instruction to take immediates from 0-5.

http://llvm-reviews.chandlerc.com/D1644

Files:
  include/llvm/IR/IntrinsicsARM.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
  test/CodeGen/ARM/intrinsics-v8.ll
  test/MC/ARM/basic-arm-instructions-v8.s
  test/MC/ARM/basic-thumb2-instructions-v8.s
  test/MC/ARM/invalid-hint-arm.s
  test/MC/ARM/invalid-hint-thumb.s
  test/MC/Disassembler/ARM/basic-arm-instructions-v8.txt
  test/MC/Disassembler/ARM/invalid-armv7.txt
  test/MC/Disassembler/ARM/invalid-thumbv7.txt
  test/MC/Disassembler/ARM/thumb2-v8.txt
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