Matt Arsenault 4c1e9ec008 AMDGPU: Don't add same instruction multiple times to worklist ...

When the instruction is processed the first time, it may be
deleted resulting in crashes. While the new test adds the same
user to the worklist twice, this particular case doesn't crash
but I'm not sure why.

llvm-svn: 290191

2016-12-20 18:55:06 +00:00

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