[PATCH] R600/SI: Fix off by 1 error in used register count

[Matt Arsenault]

The register numbers start at 0, so if only 1 register was used, this was reported as 0.

http://reviews.llvm.org/D5312

Files:
  lib/Target/R600/AMDGPUAsmPrinter.cpp
  test/CodeGen/R600/no_vgpr_used.ll
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