8031359: Invocable.getInterface() works incorrectly if interface has default methods
Reviewed-by: attila, hannesw
get "foo"() {}
set "foo"(x) {}
get bar() {}
set bar(x) {}
get ":"() {}
set ":"(x) {}
get 12() {}
set 12(x) {}
get 1.8e-8() {}
set 1.8e-8(x) {}