[PATCH] [RFC][12/17]TILE-Gx: VLIW Packetizer support for tilegx

[Jiong WANG]

This implement the Hexagon style VLIW Packetizer. tilegx has 3 physical units and two issue mode

for X mode
===
X0 occupy P0
X1 occupy P1 & P2

for Y mode
===
Y0 occupy P0
Y1 occupy P1
Y2 occupy P2

Please review, thanks

---
Regards,
Jiong
Tilera Corporation


http://llvm-reviews.chandlerc.com/D522

Files:
  lib/Target/Tile/TileSchedule.td
  lib/Target/Tile/TileVLIWPacketizer.cpp
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