[PATCH] Add direct moves to/from VSR and exploit them for FP/INT conversions

[Nemanja Ivanovic]

Addressed the comments from Bill and Eric. Notable changes:

- we use conversions directly to single-precision when converting to f32 (rather than converting to f64 and subsequently rounding)
- test case now does not specify a specific register except where required by the ABI (instead a regex is used)
- formatting issues fixed
- removed the unnecessary change to stfiwx.ll test case (since no longer required)


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8928

Files:
  lib/Target/PowerPC/PPC.td
  lib/Target/PowerPC/PPCFastISel.cpp
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstrFormats.td
  lib/Target/PowerPC/PPCInstrVSX.td
  lib/Target/PowerPC/PPCSubtarget.cpp
  lib/Target/PowerPC/PPCSubtarget.h
  test/CodeGen/PowerPC/fp-int-conversions-direct-moves.ll
  test/MC/Disassembler/PowerPC/vsx.txt
  test/MC/PowerPC/vsx.s

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