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

[Rickey Bowers Jr. via llvm-commits]

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bitRAKE wrote:

Actually, the coalescing by `llvm-mc` is incorrect because it doesn't add whitespace - it just joins all the linker commands together. Which could change their meaning. Perhaps they should remain separate with no assumption about the whitespace or linker.

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