Fix wrong iterator type

ELFEntityIterator does not implement RandomAccessIterator. It does
not even implement BidirectionalIterator.

This patch fixes LLD build issue when compiled with MSVC2013 with
debug: MSVC's find_if checks if the start iterator is before the end
iterator in the sense of operator< if it declares implementing
RandomAccessIterator. If a class does not have operator<, it fails
to compile.

llvm-svn: 206825

llvm/include/llvm/Object/ELF.h

@@ -60,7 +60,7 @@ public:
   public:
     typedef ptrdiff_t difference_type;
     typedef EntT value_type;
-    typedef std::random_access_iterator_tag iterator_category;
+    typedef std::forward_iterator_tag iterator_category;
     typedef value_type &reference;
     typedef value_type *pointer;