[PATCH] [Power] Add a new feature flag for support of the sync instruction

[Robin Morisset]

Hi jfb, hfinkel, wschmidt,

This was suggested by hfinkel in D5180.
HasSYNC is set to true whenever IsBookE is false + a2 and a2q,
based on the original comment by hfinkel. Is there any other Power architecture
that should have it set ?

Depends on D5180

http://reviews.llvm.org/D5316

Files:
  lib/Target/PowerPC/PPC.td
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCSubtarget.cpp
  lib/Target/PowerPC/PPCSubtarget.h
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