boolean, sizeofstring: update after talking with x/tools folks

sizeofstring/step1.go

@@ -1,7 +1,7 @@
 //go:build ignore
 
 // step1.go
-package bocchi
+package main
 
 import "unsafe"
 
@@ -11,3 +11,5 @@ type Bocchi struct {
 }
 
 var _ [0]struct{} = [unsafe.Sizeof(Bocchi{}) - 0]struct{}{}
+
+func main() {}