[lld] [llvm] [lld][DebugInfo/BTF] Add BTF section merging and deduplication (PR #183915)

[Can H. Tartanoglu via llvm-commits]

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+//===- BTFBuilder.h - BTF builder/writer -----------------------*- C++ -*-===//
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caniko wrote:

Understood on your review bandwidth. Thanks for catching the header comment style despite your load, I will update those to current LLVM standards.

https://github.com/llvm/llvm-project/pull/183915