* benchmark-suite/benchmarks/continuations.bm: Increase "call/cc"
iterations from 300 to 12000.
* benchmark-suite/benchmarks/srfi-13.bm ("strings"): Increase "copy"
iterations from 1100 to 20000, and "pad" from 6800 to 34000.
* benchmark-suite/benchmarks/uniform-vector-read.bm
("uniform-vector-read!"): Increase "uniform-vector-write" iterations
from 500 to 4000, and "uniform-vector-read!" from 500 to 20000.