VarStreamArrayIterator needed non-const operator* overload.

Without this change, the operator-> provided by iterator_facade lost type
qualifiers.

Differential Revision: https://reviews.llvm.org/D32235

llvm-svn: 300877

Author: amccarth-google

llvm/include/llvm/Support/BinaryStreamArray.h

@@ -162,6 +162,11 @@ class VarStreamArrayIterator
     return ThisValue;
   }
 
+  ValueType &operator*() {
+    assert(Array && !HasError);
+    return ThisValue;
+  }
+
   IterType &operator+=(unsigned N) {
     for (unsigned I = 0; I < N; ++I) {
       // We are done with the current record, discard it so that we are