Denesting of functions definitions.
Fix of parseintperf

The code was generating random values between 0 and 2^31-1 instead of 0 and 2^32-1 as the other implementations.
Prevent constant propagation in fib microbenchmark
Prevent constant propagation in fib microbenchmark
Merge pull request #8847 from pabloferz/pf/perf

Microbenchmarks fixes (C, R, Octave)