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Another --warn-unreachable false positive #7207

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@scop

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@scop

I'm not sure if this is the same issue as #7204, but here's another --warn-unreahcable false positive with a much smaller test case:

from numbers import Number

def test(x: float) -> None:
    if not isinstance(x, Number):
        raise
    print("Not unreachable!")

...gives with mypy 0.720:

t.py:6: error: Statement is unreachable

Assuming mypy relies on x always being a float like the type hint says, the "not isinstance" is actually always False and I guess it would be legitimate for the error to be issued on line 5 (raise). But surely the print statement on line 6 is never unreachable, right?

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