Store: checkExpr funcPtr => closure

cl/_testrt/closure/in.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"github.com/goplus/llgo/internal/runtime/c"
+)
+
+func main() {
+	fn1 := func(n1, n2 int) {
+		c.Printf(c.Str("%d %d\n"), n1, n2)
+	}
+	fn2 := func() {
+		fn1(100, 200)
+	}
+	fn2()
+}