[llvm-commits] Add scope info in DebugLoc

[Argiris Kirtzidis]

The attached patch introduces 'DebugScope' which gets embedded in DebugLoc.
This allows scope info to be readily available (along with line info) 
for each machine instruction, and will pull the DwarfWriter out of the 
instruction selectors.

Please review and let me know what you think!

-Argiris
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