ELF: Add `Rela` member variable to Config.

The member is true if we want to create relocatin sections with RELA
instead of REL.

llvm-svn: 263387
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index b22407d..22c6145 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -327,17 +327,20 @@
 }
 
 template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) {
-  initSymbols<ELFT>();
   // For LTO
   InitializeAllTargets();
   InitializeAllTargetMCs();
   InitializeAllAsmPrinters();
   InitializeAllAsmParsers();
 
+  initSymbols<ELFT>();
+
   SymbolTable<ELFT> Symtab;
   std::unique_ptr<TargetInfo> TI(createTarget());
   Target = TI.get();
 
+  Config->Rela = ELFT::Is64Bits;
+
   if (!Config->Shared && !Config->Relocatable) {
     // Add entry symbol.
     //