Make sure binary_trees_gc actually stresses GC.
Make sure binary_trees_gc actually stresses GC.

munificent/wren,foresterre/wren,foresterre/wren,munificent/wren,Nelarius/wren,minirop/wren,munificent/wren,minirop/wren,Rohansi/wren,Nave-Neel/wren,minirop/wren,Nelarius/wren,munificent/wren,Rohansi/wren,foresterre/wren,munificent/wren,Rohansi/wren,Nave-Neel/wren,munificent/wren,foresterre/wren,minirop/wren,Nave-Neel/wren,Rohansi/wren,minirop/wren,Nave-Neel/wren,foresterre/wren,Nelarius/wren,Nelarius/wren,Nelarius/wren