[issue39150] See if PyToken_OneChar would be faster as a lookup table

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

I will take a look and try to reproduce the benchmarks result you mentioned, but if under PGO there is no substantial performance increase is much less appealing as the lookup table code is less clear and maintainable than the simple switch. Also you have a branch that is a good candidate to trigger the same branch mispredictions as the default of the switch (c1>=37 && c1<=126).

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<https://bugs.python.org/issue39150>
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