build.Do: verbose

cl/_testdata/importpkg/in.go

@@ -5,5 +5,6 @@ import "github.com/goplus/llgo/cl/internal/stdio"
 var hello = [...]int8{'H', 'e', 'l', 'l', 'o', '\n', 0}
 
 func main() {
+	_ = stdio.Max(2, 100)
 	stdio.Printf(&hello[0])
 }

cl/_testdata/importpkg/out.ll

@@ -28,10 +28,13 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 define void @main() {
 _llgo_0:
   call void @main.init()
+  %0 = call i64 @"github.com/goplus/llgo/cl/internal/stdio.Max"(i64 2, i64 100)
   call void (ptr, ...) @printf(ptr @main.hello)
   ret void
 }
 
 declare void @"github.com/goplus/llgo/cl/internal/stdio.init"()
 
+declare i64 @"github.com/goplus/llgo/cl/internal/stdio.Max"(i64, i64)
+
 declare void @printf(ptr, ...)