[dev.go2go] go/types: add testcase for crash 9 of #39634

This test passes type-checking without problems but the
generated code causes a cmd/compile error (filed #40486).

Updates #39634.

Change-Id: If3dd28605f6d8792c6bd5bb032624e9a6140b2c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/245742
Reviewed-by: Robert Griesemer <[email protected]>

Author: griesemer

src/go/types/fixedbugs/issue39634.go2

@@ -30,6 +30,10 @@ type foo8(type A) interface { type A }
 func bar8(type A foo8(A))(a A) {}
 func main8() {}
 
+// crash 9
+type foo9(type A) interface { type foo9(A) }
+func _() { var _ = new(foo9(int)) }
+
 // crash 12
 var u /* ERROR cycle */ , i [func /* ERROR used as value */ /* ERROR used as value */ (u, c /* ERROR undeclared */ /* ERROR undeclared */ ) {}(0, len)]c /* ERROR undeclared */ /* ERROR undeclared */