* switch var to let in benchmark directory
* Revert "switch var to let in benchmark directory"
This reverts commit 6133471e76.
* change gyb files to fix error
We were not doing any work in this benchmark at -O because we were removing dead
code (to build a tuple of partially applied functions). Now that we are actually
calling the functions we can't eliminate dead code.
This is going to appear as a regression but it is none.