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[dwarfdump] Warn for tags with DW_CHILDREN_yes but no children.

Authored by JDevlieghere on Sep 23 2020, 10:00 PM.

Description

[dwarfdump] Warn for tags with DW_CHILDREN_yes but no children.

Flag DIEs that have DW_CHILDREN_yes set in their abbreviation but don't
actually have any children.

rdar://59809554

Differential revision: https://reviews.llvm.org/D88048