Blender Git Loki

Depsgraph debug: Remove hardcoded array of BLENDER_MAX_THREADS elements

Allocate statistics array dynamically, so increasing max number of threads does
not increase sloppyness of the memory usage.

For the further cleanups: we can try alloca-ing this array, but it's also not
really safe because we can have quite huge number of threads in the future.
Plus statistics will allocate memory for each individual entry, so using alloca
is not going to give anything beneficial here.