[PATCH] [SPARC] Cleanup handling of the Y/ASR registers.

[James Y Knight]

Hi echristo,

- Implement copying ASR to/from GPR regs.
- Mark ASRs as non-allocatable, so it won't try to arbitrarily use
  them inappropriately.
- Instead of inserting explicit WRASR/RDASR nodes in the MUL/DIV
  routines, just do normal register copies.
- Also...mark div as using Y, not just writing it.

Added a test case with some code which previously died with an
assertion failure (with -O0), or produced wrong code (otherwise).

(Third time's the charm?)

http://reviews.llvm.org/D10401

Files:
  lib/Target/Sparc/SparcISelDAGToDAG.cpp
  lib/Target/Sparc/SparcInstrInfo.cpp
  lib/Target/Sparc/SparcInstrInfo.td
  lib/Target/Sparc/SparcRegisterInfo.td
  test/CodeGen/SPARC/basictest.ll
  test/CodeGen/SPARC/multiple-div.ll

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