[llvm-commits] [llvm] - Patch to update the line number information in pass -mem2reg (review only)

[Zhou Sheng]

Attached is the patch to update the line number information in pass
-mem2reg.
Currently this pass will delete the variable declaration info, and keep the
line number info.
But the kept line number info is not updated, and some is redundant or not
correct, this patch just updates those info.

Just for review.
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