8024255: When a keyword is used as object property name, the property can not be deleted
Reviewed-by: jlaskey, lagergren
a=10
a=9
a=8
a=7
a=6
a=5
a=4
a=3
a=2
a=1
a=0
10
a=0
a=1
a=2
a=3
a=4
a=5
a=6
a=7
a=8
a=9
a=10
ok
a=0
a=1
a=2
a=3
a=4
a=5
a=6
a=7
a=8
a=9
a=10
done
no arg
x=0
x=1
x=2
x=3
x=4
x=5
x=6
x=7
x=8
x=9
x=10
ok
done