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

[Alexandre Ganea via llvm-commits]

================
@@ -0,0 +1,43 @@
+; fasm2 directives-multiple.asm
----------------
aganea wrote:

So the .OBJ below is generated from this .ASM file right? But this file is unused right now by the LLD tests? I'm fine keeping it if you add a little comment at the top explaining the situation, and that the LLVM tooling should be fixed eventually to not have the .OBJ file there.

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