[ruby/prism] Split assertion per expressions

Expressions joined with `&&` are better asserted separately, so that
it is clear from the failure message which expression is false.

Also, `unsigned long` may not be enough for `ptrdiff_t`, e.g., Windows.
Saying that `ptrdiff_t` can be larger than `SIZE_MAX` means that
`PTRDIFF_MAX` is larger than `SIZE_MAX` and `ptrdiff_t` is sufficient
to represent `SIZE_MAX`, otherwise if `PTRDIFF_MAX` is smaller than
`SIZE_MAX`, `diff` will always be smaller than `SIZE_MAX` as well.
`diff` could be equal to `SIZE_MAX` only if `PTRDIFF_MAX` is equal to
`SIZE_MAX` and these assertions would pass, but I don't think there is
any platform where that is the case.

https://github.com/ruby/prism/commit/1fc6dfcada

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