[llvm-commits] Create DebugLocs even without DwarfWriter

[Argiris Kirtzidis]

The attached patch:

-Moves the DwarfWriter::ValidDebugInfo check to a static 
DIDescriptor::ValidDebugInfo
-Creates DebugLocs without the need to have a DwarfWriter around

This is another tiny step towards the "get DwarfWriter out of 
instruction selectors" direction.

-Argiris
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