runtime: special case copy, equal for one-word interface values
Based on the observation that a great number of the types that are copied or compared in interfaces, maps, and channels are word-sized, this uses specialized copy and equality functions for them that use a word instead of 4 or 8 bytes. Seems to yield 0-6% improvements in performance in the benchmarks I've run. For example, with the regexp benchmarks: Before: regexp.BenchmarkLiteral 500000 3.26 µs/op regexp.BenchmarkNotLiteral 100000 13.67 µs/op regexp.BenchmarkMatchClass 100000 18.72 µs/op regexp.BenchmarkMatchClass_InRange 100000 20.04 µs/op regexp.BenchmarkReplaceAll 100000 27.85 µs/op After: regexp.BenchmarkLiteral 500000 3.11 µs/op regexp.BenchmarkNotLiteral 200000 13.29 µs/op regexp.BenchmarkMatchClass 100000 17.65 µs/op regexp.BenchmarkMatchClass_InRange 100000 18.49 µs/op regexp.BenchmarkReplaceAll 100000 26.34 µs/op R=rsc CC=golang-dev https://golang.org/cl/1967047
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