Remove unnecessary cast.

llvm-svn: 304240
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 99c464e..2628977 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -590,7 +590,7 @@
   // It calculates and assigns the offsets for each section and also
   // updates the output section size.
   auto &Cmd = cast<InputSectionDescription>(Base);
-  for (InputSectionBase *Sec : Cmd.Sections) {
+  for (InputSection *Sec : Cmd.Sections) {
     // We tentatively added all synthetic sections at the beginning and removed
     // empty ones afterwards (because there is no way to know whether they were
     // going be empty or not other than actually running linker scripts.)
@@ -602,7 +602,7 @@
     if (!Sec->Live)
       continue;
     assert(CurOutSec == Sec->OutSec);
-    output(cast<InputSection>(Sec));
+    output(Sec);
   }
 }