[LLD][COFF] Add /nodbgdirmerge to control debug directory section (#159235)
Resolves #141712.
As described in the issue, this PR adds support for `/nodbgdirmerge`
flag in LLD to align with MS link. When the flag is specified, the
linker will emit the debug directory section in `.cvinfo` section,
instead of merging it to the `.rdata`. The flag will be ignored on
MinGW.
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Co-authored-by: namazso <admin@namazso.eu>