Store the start of the current frame's stack in a local.
Store the start of the current frame's stack in a local.

binary_trees - wren           ..........  3337  0.30s   99.03% relative to baseline
delta_blue - wren             ..........  6989  0.14s   97.90% relative to baseline
fib - wren                    ..........  2985  0.33s  121.72% relative to baseline
for - wren                    ..........  8530  0.12s   99.06% relative to baseline
method_call - wren            ..........  5047  0.20s   98.74% relative to baseline

Rohansi/wren,daimajia/wren,bigdimboom/wren,munificent/wren,bigdimboom/wren,Nelarius/wren,Rohansi/wren,munificent/wren,munificent/wren,Nave-Neel/wren,Nave-Neel/wren,Rohansi/wren,foresterre/wren,minirop/wren,foresterre/wren,foresterre/wren,bigdimboom/wren,foresterre/wren,lluchs/wren,lluchs/wren,lluchs/wren,Nelarius/wren,foresterre/wren,Nelarius/wren,lluchs/wren,daimajia/wren,daimajia/wren,minirop/wren,Nave-Neel/wren,minirop/wren,minirop/wren,Nelarius/wren,minirop/wren,Nelarius/wren,bigdimboom/wren,munificent/wren,munificent/wren,daimajia/wren,Nave-Neel/wren,munificent/wren,Rohansi/wren