[lld] [LLD][COFF] Add -build-id flag to generate .buildid section. (PR #71433)

[via llvm-commits]

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@@ -196,6 +196,9 @@ defm guard_longjmp : B<"guard-longjmp",
   "Do not enable Control Flow Guard long jump hardening">;
 defm error_limit:
   EqLong<"error-limit", "Maximum number of errors to emit before stopping (0 = no limit)">;
+def build_id: J<"build-id=">, HelpText<"Generate build ID note (pass none to disable)">, 
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zmodem wrote:

What is one supposed to pass after `=` to enable it?

If we only support `-build-id` and `-build-id=none`, perhaps those should just be two flags instead?

https://github.com/llvm/llvm-project/pull/71433