Matt Arsenault 86ffcddf42 R600/SI: Fix off by 1 error in used register count
The register numbers start at 0, so if only 1 register
was used, this was reported as 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217636 91177308-0d34-0410-b5e6-96231b3b80d8
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