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Commit c9d4b417 authored by Simon Pilgrim's avatar Simon Pilgrim
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[CodeGen] Ensure UserValue::getDebugLoc() and UserLabel::getDebugLoc()... 

[CodeGen] Ensure UserValue::getDebugLoc() and UserLabel::getDebugLoc() consistently return a const reference NFCI.

Avoids a lot of unnecessary tracking increments/decrements of the underlying TrackingMDNodeRef.
parent dd21c6b8
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