Add branchless is_alnum borrowed from MSVC++'s std::regex' _Is_word#823

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ras0219-msft merged 1 commit intomicrosoft:masterfrom

BillyONeal:dev/bion/isalnum_perf

Aug 1, 2018

Commits on Aug 1, 2018

Add branchless is_alnum borrowed from MSVC++'s std::regex' _Is_word; should be about 5x faster.
BillyONeal
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