[PATCH] Don't try to emit loopVectorize warning if DebugLoc isn't available

[Davide Italiano]

In http://reviews.llvm.org/D9463#165235, @dexonsmith wrote:

> Would it be better to make emitOptimizationRemarkMissed() resilient to a null DebugLoc?   It seems strange to require debug info to print pass remarks.


emitLoopVectorizeWarning() should actually be made resilient because that's where the crash happen.
I'll take a look at this further tomorrow.


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