These changes almost do not speed up the program with the `-prod` flag,
since modern С compilers can do such optimization on their own, but in
normal mode, the performance gain is from 1.6 (concatenation) to 1.8 (repeat) times.
Concatenation:
Old (`for` loop):
Time (mean): 3.699 s +- 0.071 s [User: 3.629 s, System: 0.069 s]
Range (min ... max): 3.548 s ... 3.741 s 10 runs
New (vmemcpy):
Time (mean): 2.305 s +- 0.065 s [User: 2.263 s, System: 0.041 s]
Range (min ... max): 2.172 s ... 2.355 s 10 runs
`vmemcpy version` ran 1.60 +- 0.05 times faster than 'for loop version'
vlib is the term for all modules included by default with V and
maintained as part of the V source code repository.
Some included modules depend on third party libraries, and these are kept
separate in the thirdparty directory at the root level of the source
repository.
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