[PATCH] [NVPTX] Fix issue introduced in D10321

[Justin Holewinski]

LTGM

> On Jun 30, 2015, at 2:02 PM, Jingyue Wu <jingyue at google.com> wrote:
> 
> LGTM
> 
> 
> http://reviews.llvm.org/D10844
> 
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