Andrew Kelley 3f680abbe2 stage2: tokenizer: require null terminated source ...

By requiring the source file to be null-terminated, we avoid extra
branching while simplifying the logic at the same time.

Running ast-check on a large zig source file (udivmodti4_test.zig),
master branch compared to this commit:
 * 4% faster wall clock
 * 7% fewer cache misses
 * 1% fewer branches

2021-07-02 13:27:35 -07:00

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