[ELF] SHF_LINK_ORDER should sort based on InputSectionDescriptions
    
This change alters the sorting for OutputSections with the SHF_LINK_ORDER
flag in OutputSection::finalize() to use the InputSectionDescription
representation and not the OutputSection::Sections representation.

Differential revision: https://reviews.llvm.org/D33772

llvm-svn: 304700
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index f68e07f..79ca67e 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -257,11 +257,6 @@
   if (ErrorCount)
     return;
 
-  if (!Script->Opt.HasSections)
-    Script->fabricateDefaultCommands();
-  else
-    Script->synchronize();
-
   for (BaseCommand *Base : Script->Opt.Commands)
     if (auto *Cmd = dyn_cast<OutputSectionCommand>(Base))
       OutputSectionCommands.push_back(Cmd);
@@ -1261,6 +1256,12 @@
       applySynthetic({InX::MipsGot},
                      [](SyntheticSection *SS) { SS->updateAllocSize(); });
   }
+
+  if (!Script->Opt.HasSections)
+    Script->fabricateDefaultCommands();
+  else
+    Script->synchronize();
+
   // Fill other section headers. The dynamic table is finalized
   // at the end because some tags like RELSZ depend on result
   // of finalizing other sections.