COFF: Remove unused field SectionChunk::SectionIndex.

llvm-svn: 240512
diff --git a/lld/COFF/InputFiles.cpp b/lld/COFF/InputFiles.cpp
index ec8063e..8359495 100644
--- a/lld/COFF/InputFiles.cpp
+++ b/lld/COFF/InputFiles.cpp
@@ -136,7 +136,7 @@
       continue;
     if (Sec->Characteristics & llvm::COFF::IMAGE_SCN_LNK_REMOVE)
       continue;
-    auto *C = new (Alloc) SectionChunk(this, Sec, I);
+    auto *C = new (Alloc) SectionChunk(this, Sec);
     Chunks.push_back(C);
     SparseChunks[I] = C;
   }