Should -fcross-jumping be part of -O1?

[Richard Kenner]

    Well as part of this thought experiment, please consider that if each
    of these five axes has three settings, then there are 3**5
    combinations, which is a large number, and of course there is no
    possibility of the compiler behaving in 3**5 significantly different ways.

Right now, I count about 20 different optimizations switches and
2**20 is significantly larger than 3**5!