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

[Peter Smith via llvm-commits]

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@@ -63,6 +63,10 @@ defm branch_to_branch: BB<"branch-to-branch",
     "Enable branch-to-branch optimization (default at -O2)",
     "Disable branch-to-branch optimization (default at -O0 and -O1)">;
 
+defm btf_merge: BB<"btf-merge",
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smithp35 wrote:

There's an easy to miss man page in `lld/docs/ld.lld.1` that could do with an entry for btf-merge. 

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