[llvm] r239943 - AMDGPU: Change unreachable into reported error

[Matt Arsenault]

> On Jun 17, 2015, at 6:35 PM, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> 
> Is it testable?

Not really. The testcase would be pretty big, and it shouldn’t really ever happen unless there’s a bug somewhere. Getting this wrong isn’t going to break the compiler somewhere, so I don’t think it should crash and only report that the resulting program probably won’t work correctly.

-Matt
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