printing: commit some refactors (probably broken)

examples/add/asm.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package main
 
 import (
@@ -5,11 +7,11 @@ import (
 )
 
 func main() {
-	TEXT("add", "func(x, y uint64) uint64")
+	TEXT("Add", "func(x, y uint64) uint64")
 	x := Load(Param("x"), GP64v())
 	y := Load(Param("y"), GP64v())
 	ADDQ(x, y)
 	Store(x, ReturnIndex(0))
 	RET()
-	EOF()
+	Generate()
 }