[issue37837] add internal _PyLong_FromUnsignedChar() function

[Sergey Fedoseev]

Sergey Fedoseev <fedoseev.sergey at gmail.com> added the comment:

$ gcc -v 2>&1 | grep 'gcc version'
gcc version 8.3.0 (Debian 8.3.0-19)

using ./configure --enable-optimizations --with-lto
$ python -m perf timeit -s "from collections import deque; consume = deque(maxlen=0).extend; b = bytes(2**20)" "consume(b)" --compare-to=../cpython-master/venv/bin/python
/home/sergey/tmp/cpython-master/venv/bin/python: ..................... 6.71 ms +- 0.09 ms
/home/sergey/tmp/cpython-dev/venv/bin/python: ..................... 6.71 ms +- 0.08 ms
Mean +- std dev: [/home/sergey/tmp/cpython-master/venv/bin/python] 6.71 ms +- 0.09 ms -> [/home/sergey/tmp/cpython-dev/venv/bin/python] 6.71 ms +- 0.08 ms: 1.00x slower (+0%)

using ./configure --enable-optimizations
$ python -m perf timeit -s "from collections import deque; consume = deque(maxlen=0).extend; b = bytes(2**20)" "consume(b)" --compare-to=../cpython-master/venv/bin/python
/home/sergey/tmp/cpython-master/venv/bin/python: ..................... 6.73 ms +- 0.17 ms
/home/sergey/tmp/cpython-dev/venv/bin/python: ..................... 4.28 ms +- 0.01 ms
Mean +- std dev: [/home/sergey/tmp/cpython-master/venv/bin/python] 6.73 ms +- 0.17 ms -> [/home/sergey/tmp/cpython-dev/venv/bin/python] 4.28 ms +- 0.01 ms: 1.57x faster (-36%)

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<https://bugs.python.org/issue37837>
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