Simplify. NFC.

With the recent changes there should always be a 1:1 correspondence in
the correct order between OutputSections and OutputSectionCommands.

llvm-svn: 282176
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index d4577c2..cfb1fb3 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -546,9 +546,7 @@
       Opt.Commands.insert(CmdIter,
                           llvm::make_unique<OutputSectionCommand>(Name));
     } else {
-      // If linker script lists alloc/non-alloc sections is the wrong order,
-      // this does a rotate to bring the desired command in place.
-      std::rotate(CmdIter, Pos, Pos + 1);
+      assert(Pos == CmdIter && "Section order doesn't match the linker script");
     }
     ++CmdIndex;
   }