[PATCH] Sparc: Prefer reg+reg address encoding when only one register used.

[James Y Knight]

Reg+%g0 is preferred to Reg+imm0 by the manual, and is what GCC produces.

Futhermore, reg+imm is invalid for the (not yet supported) "alternate address space" instructions.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8753

Files:
  lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
  test/MC/Disassembler/Sparc/sparc-mem.txt
  test/MC/Sparc/sparc-ctrl-instructions.s
  test/MC/Sparc/sparc-mem-instructions.s

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