[lld] [lld][COFF] Fix: Merge `.drectve` sections in ObjFile::readSections (PR #86380)

[Rickey Bowers Jr. via llvm-commits]

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bitRAKE wrote:

Unfortunately, the LLVM tools coalesce `.drectve` sections - perhaps why this error was overlooked for so long. I can provide the assembly file that produces the OBJ with [fasm2](https://flatassembler.net/).

https://github.com/llvm/llvm-project/pull/86380