[clang] [llvm] [DebugInfo][BPF] Add 'btf:type_tag' annotation in DWARF (PR #91423)

[via llvm-commits]

yonghong-song wrote:

Looks like some changes are duplicate from https://github.com/llvm/llvm-project/pull/91422, e.g., llvm/lib/Bitcode/Reader/MetadataLoader.cpp. There are some other files are duplicated as well. Could you do a cleanup here? This will make it easy to compare to https://reviews.llvm.org/D143967.

https://github.com/llvm/llvm-project/pull/91423