[ELF] Convert PltSection to input section

Differential revision: https://reviews.llvm.org/D26842

llvm-svn: 287346
diff --git a/lld/ELF/Relocations.cpp b/lld/ELF/Relocations.cpp
index c402bce..8bcf4d2 100644
--- a/lld/ELF/Relocations.cpp
+++ b/lld/ELF/Relocations.cpp
@@ -743,7 +743,7 @@
     if (needsPlt(Expr)) {
       if (Body.isInPlt())
         continue;
-      Out<ELFT>::Plt->addEntry(Body);
+      In<ELFT>::Plt->addEntry(Body);
 
       uint32_t Rel;
       if (Body.isGnuIFunc() && !Preemptible)