[lld] ELF: Add branch-to-branch optimization. (PR #138366)

[Fangrui Song via llvm-commits]

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@@ -59,6 +59,10 @@ def build_id: J<"build-id=">, HelpText<"Generate build ID note">,
   MetaVarName<"[fast,md5,sha1,uuid,0x<hexstring>]">;
 def : F<"build-id">, Alias<build_id>, AliasArgs<["sha1"]>, HelpText<"Alias for --build-id=sha1">;
 
+defm branch_to_branch: B<"branch-to-branch",
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MaskRay wrote:

BB (only allow `--` long options) for new options (no GNU ld compatibility concern)

https://github.com/llvm/llvm-project/pull/138366