If-Statements Optimization

[JessonChan]

func foo() bool {
	println("foo")
	return true
}
func bar() bool {
	println("bar")
	return true
}

func fake() bool {
	println("fake")
	return false
}

if foo() || bar() {
}
println("---")
if foo() && bar() {
}
println("---")
if fake() && bar() {
}

result:

foo
bar
---
foo
bar
---
fake
bar

expect

foo
---
foo
bar
---
fake

[xushiwei]

Not only in if statement. For example:

x := foo() || bar()

[wangkuiyi]

Should we label this issue a bug fix other than an enhancement?