[PATCH] [PowerPC] Add Power8 Instruction Scheduling Tablegen

[Will Schmidt]

Updated with P8_LU* units added, units renamed to match documentation, and comments added/sprinkled throughout. 
A notable thanks to Pat Haugen who provided guidance on a few of these changes.

http://reviews.llvm.org/D6358

Files:
  lib/Target/PowerPC/PPCSchedule.td
  lib/Target/PowerPC/PPCScheduleP8.td
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