Call 'clear()' in ~RopePieceBTreeLeaf(), decrementing the reference

counts of the bufffers referened by the RopePieces in
RopePieceBTreeLeaf.  This (I believe) corrently fixes the leak I meant
to fix in r84601 (which ended up causing an overrelease).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@84615 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Rewrite/RewriteRope.cpp

@@ -154,6 +154,7 @@ namespace {
     ~RopePieceBTreeLeaf() {
       if (PrevLeaf || NextLeaf)
         removeFromLeafInOrder();
+      clear();
     }
 
     bool isFull() const { return NumPieces == 2*WidthFactor; }