func JumpIfFeature(jmp string, f cpu.X86Feature) {
	jump(LabelRef(jmp), f, false)
}
JumpIfFeature constructs a jump sequence that tests for one or more feature flags.
If all flags are matched, jump to the target label.
package x86
import (
	. "github.com/mmcloughlin/avo/build"
	. "github.com/mmcloughlin/avo/operand"
	"math"
	"math/bits"
	"github.com/segmentio/asm/cpu"
)