[PATCH] DebugIR: Delete old debug info instead of updating it

[Duncan P. N. Exon Smith]

While removing instances of `MDNode::replaceAllUsesWith()`, I came
across this unlikely-to-be-correct RAUW of a compile unit.

There are no tests that the updated debug info works correctly and it
looks unlikely to be useful in any way -- are you debugging the original
source, or the IR?  Instead, just delete the old debug info before
creating something new.


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