Revert 84601. Looks like it was causing failures on some systems.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@84610 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Rewrite/RewriteRope.cpp

@@ -798,8 +798,9 @@ RopePiece RewriteRope::MakeRopeString(const char *Start, const char *End) {
   memcpy(AllocBuffer->Data, Start, Len);
   AllocOffs = Len;
 
-  // Return a RopePiece that wraps 'AllocBuffer'.  The constructor of RopePiece
-  // will increment the reference count of AllocBuffer.
+  // Start out the new allocation with a refcount of 1, since we have an
+  // internal reference to it.
+  AllocBuffer->addRef();
   return RopePiece(AllocBuffer, 0, Len);
 }