Most basic test of inlining by literalization.

-- go.mod --
module testdata
go 1.12

-- a/a.go --
package a

var _ = add(1, 2) //@ inline(re"add", add)

func add(x, y int) int { return x + y }

-- add --
package a

var _ = func(x, y int) int { return x + y }(1, 2) //@ inline(re"add", add)

func add(x, y int) int { return x + y }
