Generate btf_tag annotations for DIDrived types. More specifically,
clang frontend generates the btf_tag annotations for record
fields. The annotations are represented as an DINodeArray
in DebugInfo. The following example illustrate how
annotations are encoded in IR:
distinct !DIDerivedType(tag: DW_TAG_member, ..., annotations: !10) !10 = !{!11, !12} !11 = !{!"btf_tag", !"a"} !12 = !{!"btf_tag", !"b"}
could the hasAttr test be sunk into the CollectBTFTagAnnotations function? (so it's not repeated at all the callers)