Simplify memory management.

We no longer need an explicit delete or a polymorphic destructor.

llvm-svn: 256333

lld/ELF/InputFiles.cpp

@@ -31,8 +31,6 @@ public:
 };
 }
 
-InputFile::~InputFile() {}
-
 template <class ELFT>
 ELFFileBase<ELFT>::ELFFileBase(Kind K, MemoryBufferRef M)
     : InputFile(K, M), ELFObj(MB.getBuffer(), ECRAII().getEC()) {}