regression: typevar with bound and type check causes narrowing to nothing #10605

To Reproduce

from typing import TypeVar, Type


class A:
    a: int = 1


T = TypeVar("T", bound=A)


def foo(t: Type[T], a: A) -> None:
    if type(a) is t:
        reveal_type(a) # <nothing>, with 0.8xx it was A
        a.a #  error: <nothing> has no attribute "a"

Expected Behavior

should not be narrowed to nothing, should be narrowed to A

Your Environment

• Mypy version used: 0.900 and 0.8xx
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files): no
• Python version used: 3.10
• Operating system and version: Windows 10