perf(token): Speed up 'take_until' for str/char

[epage]

Before/after (with simd)

find_slice/byte/empty   time:   [8.6164 ns 9.0722 ns 9.5994 ns]
                        change: [-43.031% -39.731% -35.814%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/slice/empty  time:   [8.9148 ns 9.4395 ns 9.9990 ns]
                        change: [-40.889% -36.871% -32.492%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/byte/start   time:   [349.03 ns 382.08 ns 418.18 ns]
                        change: [-66.578% -63.083% -59.659%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/slice/start  time:   [621.33 ns 662.95 ns 707.40 ns]
                        change: [-55.891% -51.971% -47.614%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/byte/medium  time:   [535.01 ns 560.18 ns 586.97 ns]
                        change: [-68.347% -65.802% -62.864%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/slice/medium time:   [681.00 ns 725.15 ns 772.02 ns]
                        change: [-58.167% -54.656% -50.939%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/byte/large   time:   [12.233 µs 12.845 µs 13.494 µs]
                        change: [-97.200% -96.959% -96.698%] (p = 0.00 < 0.05)
                        Performance has improved.
find_slice/slice/large  time:   [12.739 µs 13.314 µs 13.912 µs]
                        change: [-91.483% -90.773% -90.011%] (p = 0.00 < 0.05)
                        Performance has improved.

[coveralls]

Pull Request Test Coverage Report for Build 7092941784

• 4 of 14 (28.57%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 44.029%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/stream/mod.rs	4	14	28.57%

Files with Coverage Reduction	New Missed Lines	%
src/stream/mod.rs	2	30.51%

Totals
Change from base Build 7091807290:	0.3%
Covered Lines:	1224
Relevant Lines:	2780

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💛 - Coveralls