golang utils 代码
文件路径：/src/cmd/compile/internal/types/utils.go
/ Copyright 2017 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package types
const BADWIDTH = -1000000000
type bitset8 uint8
func (f *bitset8) set(mask uint8, b bool) {
if b {
*(*uint8)(f) |= mask
} else {
*(*uint8)(f) &^= mask
}
}